CN104328341B - Low-carbon alloy steel for anchor rod and heat treatment process - Google Patents
Low-carbon alloy steel for anchor rod and heat treatment process Download PDFInfo
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Abstract
The invention relates to low-carbon alloy steel for an anchor rod. The steel is prepared from the following ingredients in percentage by weight: 0.21-0.27% of carbon, 0.95-1.25% of silicon, 1.15-1.35% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.015% of sulfur, 0.025-0.030% of titanium, 0.015-0.022% of vanadium, 0.02-0.12% of nickel, 0.02-0.05% of niobium, 0.0035-0.0055% of cobalt, 0.0055-0.0065% of boron and the balance of iron and inevitable impurities. A great amount of fine, dispersed and distributed compound inclusions of titaniferous oxide and nitride can be generated through control of production process condition; the steel can contain a great amount of fine, dispersed and distributed compound inclusions of titaniferous oxide, nitride and the like, and the inclusions can increase the phase change nucleation positions of ferrite and pearlite in a cooling process after steel tempering, so that the structure of the steel from surface to center is uniform and the difficult problems that the traditional steel has high energy consumption and high production cost are solved.
Description
Technical field
The present invention relates to a kind of low-carbon alloy steel and its Technology for Heating Processing, specifically a kind of low-carbon (LC) anchor pole steel alloy and Re Chu
Science and engineering skill, belongs to metal smelt and its technical field of heat treatment technology.
Background technology
Anchor pole refers to Drilling petrosal foramen, then pours into cement mortar in petrosal foramen and inserts steel, steel after mortar condenses hardening
Material is just anchored in country rock, is anchored at steel in country rock and can efficiently control country rock or superficial part rock mass deformation by means of this, prevents
It slides and caves in, and this insertion petrosal foramen is anchored in country rock so that the steel that country rock or top rock mass play support action claim
For anchor pole.
Being continuously increased with coal mining depth, roadway support is more and more difficult, and mine machinery recovery percent improves and causes lane
Road section constantly expands, in addition the characteristic distributions of coal resources in China, in the urgent need to can have the new of high intensity and high-ductility simultaneously
Type high-strength tenacity structural steel.In China, original Q235 (A3) steel making adopting a diameter of 16 millimeters of most of mine bolts,
Commonly used at present is a diameter of 18～22 millimeters of low-alloy high-strength twisted steel anchor rod.That promote the use of now is 20MnSi
With 25MnSi screw-thread steel, its Technology for Heating Processing is all quenching+high tempering, mechanical property after heat treatment：Tensile strength≤
850 MPas, yield strength≤700 MPa, elongation percentage≤15%, this technique heating-up temperature is high, and energy resource consumption is big, produces into
This height, comprehensive mechanical property is poor and is difficult to obtain high intensity and high-ductility, the development of serious restriction China anchor pole material.
Content of the invention
The technical problem to be solved is, the shortcoming overcoming prior art, provides a kind of low-carbon (LC) anchor pole steel alloy and heat
Handling process, improvement heat treatment process parameter low, low production cost, production technology so that the Technology for Heating Processing of this material consumes energy
Simply, and comprehensive mechanical property is good.
In order to solve above technical problem, the present invention provides a kind of low-carbon (LC) anchor pole steel alloy, the composition that steel alloy comprises and its weight
Measuring percentage composition is：Carbon：0.21～0.27%, silicon：0.95～1.25%, manganese：1.15～1.35%, phosphorus≤0.015%, sulphur≤
0.015%, titanium 0.025%～0.030%, vanadium 0.015%～0.022%, nickel 0.02%～0.12%, niobium 0.02%～0.05%, cobalt
0.0035%～0.0055%, boron 0.0055%～0.0065%, remaining is iron and inevitable impurity；
In described steel, the complex inclusion quantity of a size of 0.2-3.5 μm of titanium-containing oxide is 1200-1400/mm2；Chi
The very little MnS complex inclusion quantity being more than 60 μm is 6-8/cm2, the complex inclusion quantity more than 5 μm for the size is less than 2
Individual/mm2；After the welding of 50-200KJ/cm high heat-input, -40 DEG C of ballistic work mean values of weld coarse crystal region are more than 50J；Steel group
Knit and be characterized as：It is pro-eutectoid ferrite at austenite grain boundary, 65-67 μm of average grain size, occupied area fraction is less than 40%；
It is fine acicular ferrite inside austenite crystal, occupied area fraction is more than 60%.
The restriction technical scheme further of the present invention, aforesaid low-carbon (LC) anchor pole steel alloy, described impurity controls by weight percentage
For：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%,
Antimony：≤ 0.010%.
Aforesaid low-carbon (LC) anchor pole steel alloy, the composition that steel alloy comprises and its weight percentage are：Carbon：0.21%, silicon：
0.95%, manganese：1.15%, phosphorus：0.012%, sulphur：0.01:0%, titanium：0.025%, vanadium：0.015%, nickel；0.02%, niobium：
0.02%, cobalt：0.0035%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is by weight percentage
It is controlled to：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：
≤ 0.010%, antimony：≤ 0.010%.
Aforesaid low-carbon (LC) anchor pole steel alloy, the composition that steel alloy comprises and its weight percentage are：Carbon：0.25%, silicon：
1.12%, manganese：1.18%, phosphorus：0.010%, sulphur：0.011%, titanium：0.025%, vanadium：0.019%, nickel：0.08%, niobium：
0.04%, cobalt：0.0045%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is by weight percentage
It is controlled to：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：
≤ 0.010%, antimony：≤ 0.010%.
Aforesaid low-carbon (LC) anchor pole steel alloy, the composition that steel alloy comprises and its weight percentage are：Carbon：0.27%, silicon：
1.25%, manganese：1.35%, phosphorus：0.015%, sulphur：0.015%, titanium：0.030%, vanadium：0.022%, nickel：0.12%, niobium：
0.05%, cobalt：0.0055%, boron：0.0065%, remaining is iron and inevitable impurity；Described impurity is by weight percentage
It is controlled to：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：
≤ 0.010%, antimony：≤ 0.010%.
A kind of heat treatment method of low-carbon (LC) anchor pole steel alloy, including forge hot → annealing → tempering → Tempering and Quenching → cooling → table
Surface strengthening is heat-treated,
Described annealing operation：After forge hot, it is heated up to 850-890 DEG C of insulation 25-30 minute, protects after then stove is cooled to 350-380 DEG C
Warm 15-19 minute, is finally cooled to room temperature；
Described tempering process：Temperature 780-790 DEG C, is incubated 16-18min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 850-880 DEG C, it is incubated 15-18min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 920-950
DEG C, it is incubated 25-28min to after temperature, then normalizing：Temperature, at 780-795 DEG C, is incubated 5-7min to after temperature；Subsequently into cooling
Operation；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 15-18 DEG C/s extremely
480-500 DEG C, then it is air cooled to 360-390 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 5-8 DEG C/s to room temperature；
Described surface peening heat treatment step：Heat treatment temperature 1120-1150 DEG C, is incubated 15-19 minute to after temperature, then adopts
With water-cooled with the cooldown rate water-cooled of 4-8 DEG C/s to room temperature.
The heat treatment method of aforesaid low-carbon (LC) anchor pole steel alloy, described annealing operation：After forge hot, it is heated up to 850 DEG C of insulations 30
Minute, it is incubated 19 minutes after then stove is cooled to 350 DEG C, be finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 18min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 850 DEG C, it is incubated 18min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 920 DEG C, to temperature
It is incubated 28min afterwards, then normalizing：Temperature, at 780 DEG C, is incubated 7min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 15 DEG C/s to 500 DEG C,
Then it is air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 8 DEG C/s to room temperature；
Described surface peening heat treatment step：1120 DEG C of heat treatment temperature, to after temperature be incubated 19 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 4 DEG C/s is to room temperature.
The heat treatment method of aforesaid low-carbon (LC) anchor pole steel alloy, described annealing operation：After forge hot, it is heated up to 870 DEG C of insulations 28
Minute, it is incubated 18 minutes after then stove is cooled to 360 DEG C, be finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 17min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 870 DEG C, it is incubated 16min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 930 DEG C, to temperature
It is incubated 26min afterwards, then normalizing：Temperature, at 785 DEG C, is incubated 6min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 16 DEG C/s to 485 DEG C,
Then it is air cooled to 385 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 7 DEG C/s to room temperature；
Described surface peening heat treatment step：1140 DEG C of heat treatment temperature, to after temperature be incubated 16 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 7 DEG C/s is to room temperature.
The heat treatment method of aforesaid low-carbon (LC) anchor pole steel alloy, described annealing operation：After forge hot, it is heated up to 890 DEG C of insulations 25
Minute, it is incubated 15 minutes after then stove is cooled to 380 DEG C, be finally cooled to room temperature；
Described tempering process：790 DEG C of temperature, is incubated 16min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 880 DEG C, it is incubated 15min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 950 DEG C, to temperature
It is incubated 25min afterwards, then normalizing：Temperature, at 795 DEG C, is incubated 5min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 18 DEG C/s to 480 DEG C,
Then it is air cooled to 390 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 5 DEG C/s to room temperature；
Described surface peening heat treatment step：1150 DEG C of heat treatment temperature, to after temperature be incubated 15 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 4 DEG C/s is to room temperature.
By the setting of the process conditions in the restriction of steel chemical composition of the present invention and cooperated technique for producing, particularly in composition
Increased " niobium " and " cobalt ", and " be tempered " in technique, " normalizing " behaviour after " surface Hardening Treatment " and " tempering "
Make, can form the field trash of a large amount of small and disperseds distribution in steel, a size of 0.2-3.5 μm containing Ti oxide
Complex inclusion quantity all exceeds several times than traditional steel, is conducive to pinning austenite crystal and refines intergranular structure, improves CGHAZ
Toughness；The quantity that large scale complex inclusion quantity in steel can be made to be less than in traditional steel, is beneficial to reduce postwelding micro-crack source,
There is high normal temperature comprehensive mechanical property and good low-temperature flexibility；By control manufacturing condition, generation tiny in a large number more
Dissipate oxide containing Ti, the complex inclusion of nitride of distribution；Can make equally distributed thin containing a large amount of disperses in steel of the present invention
The complex inclusion of little oxide containing Ti, nitride etc., these field trashes increased iron element in cooling procedure after steel tempering
Body and the nucleation site of pearlitic transformation, make even tissue from surface to center for the steel, solve traditional steel energy resource consumption greatly,
The high difficult problem of production cost.
Specific embodiment
Embodiment 1
A kind of low-carbon (LC) anchor pole steel alloy that the present embodiment provides, the composition that described steel comprise and its weight percentage are：Carbon：
0.21%, silicon：0.95%, manganese：1.15%, phosphorus：0.012%, sulphur：0.01:0%, titanium：0.025%, vanadium：0.015%, nickel；
0.02%, niobium：0.02%, cobalt：0.0035%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is pressed
Percentage by weight is controlled to：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%,
Tin：≤ 0.010%, antimony：≤ 0.010%.
The heat treatment method of the low-carbon (LC) anchor pole steel alloy of the present embodiment, including forge hot → annealing → tempering → Tempering and Quenching → cold
But → surface peening heat treatment, described annealing operation：After forge hot, it is heated up to 850 DEG C and is incubated 30 minutes, then stove is cooled to 350
It is incubated 19 minutes after DEG C, be finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 18min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 850- DEG C, it is incubated 18min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 920 DEG C, arrives
It is incubated 28min after temperature, then normalizing：Temperature, at 780 DEG C, is incubated 7min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 15 DEG C/s to 500 DEG C,
Then it is air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 8 DEG C/s to room temperature；
Described surface peening heat treatment step：1120 DEG C of heat treatment temperature, to after temperature be incubated 19 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 4 DEG C/s is to room temperature.
Embodiment 2
A kind of low-carbon (LC) anchor pole steel alloy that the present embodiment provides, the composition that described steel comprise and its weight percentage are：Carbon：
0.25%, silicon：1.12%, manganese：1.18%, phosphorus：0.010%, sulphur：0.011%, titanium：0.025%, vanadium：0.019%, nickel：
0.08%, niobium：0.04%, cobalt：0.0045%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is pressed
Percentage by weight is controlled to：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%,
Tin：≤ 0.010%, antimony：≤ 0.010%.
The heat treatment method of aforesaid low-carbon (LC) anchor pole steel alloy, including forge hot → annealing → tempering → Tempering and Quenching → cooling →
Surface peening is heat-treated, described annealing operation：After forge hot, it is heated up to 870 DEG C and is incubated 28 minutes, after then stove is cooled to 360 DEG C
Insulation 18 minutes, is finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 17min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 870 DEG C, it is incubated 16min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 930 DEG C, to temperature
It is incubated 26min afterwards, then normalizing：Temperature, at 785 DEG C, is incubated 6min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 16 DEG C/s to 485 DEG C,
Then it is air cooled to 385 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 7 DEG C/s to room temperature；
Described surface peening heat treatment step：1140 DEG C of heat treatment temperature, to after temperature be incubated 16 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 7 DEG C/s is to room temperature.
Embodiment 3
A kind of low-carbon (LC) anchor pole steel alloy that the present embodiment provides, the composition that described steel comprise and its weight percentage are：Institute
State the composition that steel comprise and its weight percentage is：Carbon：0.27%, silicon：1.25%, manganese：1.35%, phosphorus：0.015%,
Sulphur：0.015%, titanium：0.030%, vanadium：0.022%, nickel：0.12%, niobium：0.05%, cobalt：0.0055%, boron：0.0065%,
Remaining is iron and inevitable impurity；Described impurity is controlled to by weight percentage：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%,
Hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%, antimony：≤ 0.010%.
The heat treatment method of aforesaid low-carbon (LC) anchor pole steel alloy, including forge hot → annealing → tempering → Tempering and Quenching → cooling →
Surface peening is heat-treated, described annealing operation：After forge hot, it is heated up to 890 DEG C and is incubated 25 minutes, after then stove is cooled to 380 DEG C
Insulation 15 minutes, is finally cooled to room temperature；
Described tempering process：790 DEG C of temperature, is incubated 16min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature
For 880 DEG C, it is incubated 15min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 950 DEG C, to temperature
It is incubated 25min afterwards, then normalizing：Temperature, at 795 DEG C, is incubated 5min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 18 DEG C/s to 480 DEG C,
Then it is air cooled to 390 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 5 DEG C/s to room temperature；
Described surface peening heat treatment step：1150 DEG C of heat treatment temperature, to after temperature be incubated 15 minutes, then adopt water-cooled with
The cooldown rate water-cooled of 4 DEG C/s is to room temperature.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or the skill of equivalent transformation formation
Art scheme, all falls within the protection domain of application claims.
Claims (9)
1. a kind of low-carbon (LC) anchor pole steel alloy is it is characterised in that the composition that comprises of steel alloy and its weight percentage are：Carbon：0.21～0.27%, silicon：0.95～1.25%, manganese：1.15～1.35%, phosphorus≤0.015%, sulphur≤0.015%, titanium：0.025%～0.030%, vanadium：0.015%～0.022%, nickel：0.02%～0.12%, niobium：0.02%～0.05%, cobalt：0.0035%～0.0055%, boron：0.0055%～0.0065%, remaining is iron and inevitable impurity；
In steel, the complex inclusion quantity of a size of 0.2-3.5 μm of titanium-containing oxide is 1200-1400/mm；The MnS complex inclusion quantity that size is more than 60 μm is 6-8/cm, and the complex inclusion quantity that size is more than 5 μm is less than 2/mm；After the welding of 50-200KJ/cm high heat-input, -40 DEG C of ballistic work mean values of weld coarse crystal region are more than 50J；Steel tissue signature is：It is pro-eutectoid ferrite at austenite grain boundary, 65-67 μm of average grain size, occupied area fraction is less than 40%；It is fine acicular ferrite inside austenite crystal, occupied area fraction is more than 60%.
2. low-carbon (LC) anchor pole steel alloy according to claim 1 it is characterised in that：Described impurity is controlled to by weight percentage：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%, antimony：≤0.010%.
3. low-carbon (LC) anchor pole steel alloy according to claim 1 it is characterised in that：The composition that steel alloy comprises and its weight percentage are：Carbon：0.21%, silicon：0.95%, manganese：1.15%, phosphorus：0.012%, sulphur：0.01:0%, titanium：0.025%, vanadium：0.015%, nickel；0.02%, niobium：0.02%, cobalt：0.0035%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is controlled to by weight percentage：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%, antimony：≤0.010%.
4. low-carbon (LC) anchor pole steel alloy according to claim 1 it is characterised in that：The composition that steel alloy comprises and its weight percentage are：Carbon：0.25%, silicon：1.12%, manganese：1.18%, phosphorus：0.010%, sulphur：0.011%, titanium：0.025%, vanadium：0.019%, nickel：0.08%, niobium：0.04%, cobalt：0.0045%, boron：0.0055%, remaining is iron and inevitable impurity；Described impurity is controlled to by weight percentage：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%, antimony：≤0.010%.
5. low-carbon (LC) anchor pole steel alloy according to claim 1 it is characterised in that：The composition that steel alloy comprises and its weight percentage are：Carbon：0.27%, silicon：1.25%, manganese：1.35%, phosphorus：0.015%, sulphur：0.015%, titanium：0.030%, vanadium：0.022%, nickel：0.12%, niobium：0.05%, cobalt：0.0055%, boron：0.0065%, remaining is iron and inevitable impurity；Described impurity is controlled to by weight percentage：Oxygen：≤ 0.0015%, nitrogen：≤ 0.0080%, hydrogen：≤ 0.0001%, arsenic：≤ 0.012%, lead：≤ 0.010%, tin：≤ 0.010%, antimony：≤0.010%.
6. a kind of heat treatment method for the low-carbon (LC) anchor pole steel alloy described in claim 1, including forge hot → annealing → tempering → Tempering and Quenching → cooling → surface peening heat treatment it is characterised in that：
Described annealing operation：After forge hot, it is heated up to 850-890 DEG C of insulation 25-30 minute, is incubated 15-19 minute after then stove is cooled to 350-380 DEG C, is finally cooled to room temperature；
Described tempering process：Temperature 780-790 DEG C, is incubated 16-18min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature is 850-880 DEG C, is incubated 15-18min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 920-950 DEG C, to after temperature, be incubated 25-28min, then normalizing：Temperature, at 780-795 DEG C, is incubated 5-7min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 15-18 DEG C/s to 480-500 DEG C, be then air cooled to 360-390 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 5-8 DEG C/s to room temperature；
Described surface peening heat treatment step：Heat treatment temperature 1120-1150 DEG C, is incubated 15-19 minute to after temperature, then adopts water-cooled with the cooldown rate water-cooled of 4-8 DEG C/s to room temperature.
7. low-carbon (LC) anchor pole steel alloy according to claim 6 heat treatment method it is characterised in that：Described annealing operation：After forge hot, it is heated up to 850 DEG C and is incubated 30 minutes, be incubated 19 minutes after then stove is cooled to 350 DEG C, be finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 18min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature is 850 DEG C, is incubated 18min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 920 DEG C, to after temperature, be incubated 28min, then normalizing：Temperature, at 780 DEG C, is incubated 7min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 15 DEG C/s to 500 DEG C, be then air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 8 DEG C/s to room temperature；
Described surface peening heat treatment step：1120 DEG C of heat treatment temperature, is incubated 19 minutes to after temperature, then adopts water-cooled with the cooldown rate water-cooled of 4 DEG C/s to room temperature.
8. low-carbon (LC) anchor pole steel alloy according to claim 6 heat treatment method it is characterised in that：Described annealing operation：After forge hot, it is heated up to 870 DEG C and is incubated 28 minutes, be incubated 18 minutes after then stove is cooled to 360 DEG C, be finally cooled to room temperature；
Described tempering process：780 DEG C of temperature, is incubated 17min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature is 870 DEG C, is incubated 16min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 930 DEG C, to after temperature, be incubated 26min, then normalizing：Temperature, at 785 DEG C, is incubated 6min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 16 DEG C/s to 485 DEG C, be then air cooled to 385 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 7 DEG C/s to room temperature；
Described surface peening heat treatment step：1140 DEG C of heat treatment temperature, is incubated 16 minutes to after temperature, then adopts water-cooled with the cooldown rate water-cooled of 7 DEG C/s to room temperature.
9. low-carbon (LC) anchor pole steel alloy according to claim 6 heat treatment method it is characterised in that：Described annealing operation：After forge hot, it is heated up to 890 DEG C and is incubated 25 minutes, be incubated 15 minutes after then stove is cooled to 380 DEG C, be finally cooled to room temperature；
Described tempering process：790 DEG C of temperature, is incubated 16min to after temperature, is then air cooled to room temperature；
Described Tempering and Quenching operation：The operation being combined with a normalizing using double tempering, is first tempered for the first time：Heating-up temperature is 880 DEG C, is incubated 15min to after temperature；Then carry out second tempering after being air cooled to room temperature, heating-up temperature is 950 DEG C, to after temperature, be incubated 25min, then normalizing：Temperature, at 795 DEG C, is incubated 5min to after temperature；Subsequently into refrigerating work procedure；
Described refrigerating work procedure：Be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate water-cooled of 18 DEG C/s to 480 DEG C, be then air cooled to 390 DEG C, then adopt water-cooled with the cooldown rate water-cooled of 5 DEG C/s to room temperature；
Described surface peening heat treatment step：1150 DEG C of heat treatment temperature, is incubated 15 minutes to after temperature, then adopts water-cooled with the cooldown rate water-cooled of 4 DEG C/s to room temperature.
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| CN105420598A (en) * | 2015-12-14 | 2016-03-23 | 浙江海洋学院 | Low-carbon alloy steel for boat anchor and thermal treatment process of low-carbon alloy steel |
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| CN1418977A (en) * | 2001-11-30 | 2003-05-21 | 莱芜钢铁集团有限公司 | High-strength high-toughness anchor rod steel bar alloy steel and productive method thereof |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
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| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
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