CN102534419A - Super-martensitic stainless steel and preparation method thereof - Google Patents
Super-martensitic stainless steel and preparation method thereof Download PDFInfo
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- CN102534419A CN102534419A CN2012100645869A CN201210064586A CN102534419A CN 102534419 A CN102534419 A CN 102534419A CN 2012100645869 A CN2012100645869 A CN 2012100645869A CN 201210064586 A CN201210064586 A CN 201210064586A CN 102534419 A CN102534419 A CN 102534419A
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Abstract
The invention relates to super-martensitic stainless steel and a preparation method thereof, and belongs to the field of steel materials. The super-martensitic stainless steel comprises the following chemical components in percentage by mass: 0 to 0.03 percent of C, 0 to 0.03 percent of N, less than 0.015 percent of S, less than 0.020 percent of P, less than 1 percent of Si, less than 1 percent of Mn, 13 to 16 percent of Cr, 4 to 6 percent of Ni, 1 to 2 percent of Mo, 0.05 to 0.15 percent of Nb, 0.001 to 0.01 percent of Ti and the balance of Fe. The preparation method comprises the following steps of: smelting by using a vacuum induction furnace to obtain a casting blank which meets the requirements of chemical component ranges, performing hot forging at the temperature of 1,200 DEG C, performing hot rolling at the temperature of between 1,100 and 1,200 DEG C, performing solid solution treatment at the temperature of between 1,050 and 1,100 DEG C for 0.5 to 1 hour, performing air cooling and normalizing treatment, tempering at the temperature of between 550 and 700 DEG C for 2 to 4 hours, and performing oil cooling to room temperature. The super-martensitic stainless steel has high strength and toughness and high local corrosion resistance.
Description
Technical field
The invention belongs to field of iron and steel, particularly a kind of super martensitic stainless steel and preparation method thereof.
Background technology
Super martensitic stainless steel is through reducing the soft Martensite Stainless Steel of Ultra-low carbon that carbon content and increase nickel, molybdenum content grow up on traditional Martensite Stainless Steel bases such as 1Cr13,2Cr13.Such stainless steel has good hardening capacity, good room temperature and cryogenic mechanics performance, corrosion fatigue strength and sound attitude fracture toughness property; Cold and hot use characteristics such as good casting, forging, weldering and machining are widely used in nuclear power engineering structure, large-scale water turbine and high pressure water pump construction, oil production equal energy source field.The performance that such steel is good not only comes from its improved chemical ingredients, also is the heat treating regime that it is special.Be the lath martensite tissue after the solution treatment normalizing, to its
A C1Above temperature tempering, partial martensite take a turn for the worse become and form can be in being cooled to the room temperature process subsequently the austenite of part stable existence, obtain lath martensite+disperse at last and be distributed between the martensite lath and inner reversed austenite.Though the existence of reversed austenite is the key that such stainless steel has good plasticity and toughness, fatigue property and weldability, greatly reduce the stainless intensity of this type simultaneously.Simultaneously,, still have the carbide of Cr to separate out in the drawing process, cause the precipitate dilution of Cr on every side, destroy stainless corrosion resistance on martensite lath border and inside although such Martensite Stainless Steel carbon content is lower.
In recent years, nitrogen has obtained widespread use as austenite former in austenitic stainless steel and duplex stainless steel, not only improves stainless intensity and also significantly improves Corrosion Resistance of Stainless Steels.Also there are patent and some domestic producers' employing nitrogen alloyings to improve the intensity of super martensitic stainless steel and improve its solidity to corrosion; But because the solubleness of nitrogen in Martensite Stainless Steel is extremely low; N combines to form the nitride of Cr in the heat treatment process with Cr; Cause the precipitate dilution of Cr on every side equally, the corrosion resisting property of infringement Martensite Stainless Steel.For this reason; There is producer to adopt micro alloying element Nb; V and N combined microalloying; Be intended to rely on micro alloying element Nb and V and C and N than Cr and C and the strong bonding force of N, make micro alloying element in heat treatment process, take the lead in steel in C and N combine formation micro alloying element carbonitride to improve intensity, the carbonitride of inhibition Cr separate out the stainless solidity to corrosion of improvement.Yet; High nitrogen-containing tends to cause the appearance of thick micro alloying element carbonitride; Cause its alligatoring easily in heat treatment process because the Thermodynamically stable of the carbonitride of micro alloying element V hangs down simultaneously, not only can not effectively improve stainless steel intensity, also destroy plasticity and toughness; In addition, these designs do not consider that the proportioning between nitrogen and the micro alloying element, the micro alloying element of interpolation can not suppress the separating out of nitride of Cr in the heat treatment process fully, thereby can not effectively improve Corrosion Resistance of Stainless Steels.
Summary of the invention
To the problem that prior art exists, the present invention provides a kind of super martensitic stainless steel and preparation method thereof.This method is through C and N content in the control steel and add micro alloying element Nb, and Ti prepares a kind of super martensitic stainless steel material with high-strength and high ductility, good anti-local corrosion performance.
Super martensitic stainless steel of the present invention, its chemical constitution is by mass percentage: C:0 ~ 0.03%, N:0 ~ 0.03%, < 0.015%, P < 0.020% for S; Si 1%, Mn 1%, Cr:13 ~ 16%, Ni:4 ~ 6%; Mo:1 ~ 2%, Nb:0.05 ~ 0.15%, Ti:0.001 ~ 0.01%, surplus is Fe.
The preparation method of super martensitic stainless steel of the present invention, carry out according to following steps:
(1) the employing vacuum induction melting is met the super martensitic stainless steel strand of above-mentioned chemical ingredients area requirement, with Martensite Stainless Steel strand warp 1200 ℃ of forge hots, hot rolling in 1100 ℃ ~ 1200 ℃ scopes again;
(2) the super martensitic stainless steel plate after the hot rolling is carried out solution treatment, solid solution temperature is 1050 ℃ ~ 1100 ℃, and the treatment time is 0.5 ~ 1h, carries out normalizing treatment after the solution treatment, and air cooling is to room temperature;
(3) utilize chamber type electric resistance furnace with the super martensitic stainless steel plate of solid solution attitude at 550 ℃ ~ 700 ℃ scope tempering 2 ~ 4h, oil cooling is to room temperature, obtains the super martensitic stainless steel after the temper.
A kind of super martensitic stainless steel of the present invention and preparation method thereof; Through C and N content in the control steel; Add the micro alloying element Nb that the certain mass fractional can form the greater thermodynamic stability carbonitride with C and N simultaneously; Ti, make its in heat treatment process, take the lead in steel in remaining C and N combine to form the nano level micro alloying element carbonitride that disperse distributes, can not only effectively improve the intensity of super martensitic stainless steel; And can also effectively suppress, thereby improve the pitting resistance of super martensitic stainless steel owing to the carbonitride of Cr is separated out the precipitate generation of the stripping section of Cr on every side that causes.Super martensitic stainless steel of the present invention is after such scheme is handled; The ys of room temperature is in 700 ~ 1000MPa scope; Tensile strength is in 900 ~ 1050MPa scope; Tension set is in 17 ~ 21% scopes, and the pitting potential in 3.5%NaCl salt solution has high-strength and high ductility, good anti-local corrosion performance in 90 ~ 260mV scope.
Embodiment
To the present invention be described through different embodiment below.The present invention is not limited among these embodiment, can aforementioned again chemical ingredients and the method for manufacture scope in adjust enforcement.
Embodiment 1
Obtaining chemical ingredients by vacuum induction melting is C:0.008%, N:0.009%, S:0.007%; P:0.010%, Si:0.39%, Mn:0.63%; Cr:13.35%, Ni:4.35%, Mo:1.08%; Nb:0.11%, Ti:0.008%, the super martensitic stainless steel strand of Fe surplus.Through 1200 ℃ of forge hots, again 1200 ℃ of hot rollings.In the heat treatment furnace super martensitic stainless steel plate after the hot rolling is being carried out solution treatment, solid solution temperature is 1100 ℃, and the treatment time is 0.5h; Carry out normalizing treatment after the solution treatment, air cooling is to room temperature, at last in chamber type electric resistance furnace behind 550 ℃ of tempering 2h oil coolings; The ys of its room temperature is 920MPa, and tensile strength is 1030 MPa, and unit elongation is 17.22%; Summer is 145J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 125mV; Behind 700 ℃ of tempering 2h oil coolings, the ys of its room temperature is 700MPa, and tensile strength is 900 MPa, and unit elongation is 17.44%, and the summer is 150J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 80mV; After 600 ℃ of 2h tempering, can obtain best comprehensive obdurability and solidity to corrosion, ys is 930MPa, and tensile strength is 980 MPa, and unit elongation is 19.68%, and the summer is 160J than V-notch impact absorbing energy, the pitting potential in 3.5%NaCl salt solution reaches 90mV.
Embodiment 2
Obtaining chemical ingredients by vacuum induction melting is C:0.016%, N:0.025%, S:0.012%; P:0.009%, Si:0.34%, Mn:0.78%; Cr:14.86%, Ni:5.35%, Mo:1.55%; Nb:0.080%, Ti:0.0065%, the super martensitic stainless steel strand of Fe surplus.Through 1200 ℃ of forge hots, again 1150 ℃ of hot rollings.In the heat treatment furnace super martensitic stainless steel plate after the hot rolling is being carried out solution treatment, solid solution temperature is 1050 ℃, and the treatment time is 0.8h; Carry out normalizing treatment after the solution treatment, back air cooling is to room temperature, at last in chamber type electric resistance furnace behind 550 ℃ of tempering 4h oil coolings; The ys of its room temperature is 940 MPa, and tensile strength is 1040MPa, and unit elongation is 18.62%; Summer is 150J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 190mV; Behind 700 ℃ of tempering 2h oil coolings, the ys of its room temperature is 720MPa, and tensile strength is 920MPa, and unit elongation is 17.11%, and the summer is 155J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 170mV; After 600 ℃ of 2h tempering, can obtain best comprehensive obdurability and solidity to corrosion, ys is 940MPa; Tensile strength is 1000MPa; Unit elongation is 19.40%, and the summer is 160J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 175mV.
Embodiment 3
Obtaining chemical ingredients by vacuum induction melting is C 0.028%, N:0.015%, S:0.004%; P:0.018%, Si:0.68%, Mn:0.48%; Cr:12.91%, Ni:5.65%, Mo:2.05%; Nb:0.075%, Ti:0.0043%, the super martensitic stainless steel strand of Fe surplus.Through 1200 ℃ of forge hots, again 1100 ℃ of hot rollings.In the heat treatment furnace super martensitic stainless steel plate after the hot rolling is being carried out solution treatment, solid solution temperature is 1050 ℃, and the treatment time is 1h; Carry out normalizing treatment after the solution treatment, back air cooling is to room temperature, at last in chamber type electric resistance furnace behind 575 ℃ of tempering 2h oil coolings; The ys of its room temperature is 980MPa, and tensile strength is 1030 MPa, and unit elongation is 19.65%; Summer is 165J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 240mV; Behind 650 ℃ of tempering 2h oil coolings, the ys of its room temperature is 720MPa, and tensile strength is 950 MPa, and unit elongation is 21.05%, and the summer is 190J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution is 250mV; After 600 ℃ of 2h tempering, can obtain best comprehensive obdurability and solidity to corrosion, ys is 960MPa; Tensile strength is 1010 MPa; Unit elongation is 19.38%, and the summer is 160J than V-notch impact absorbing energy, and the pitting potential in 3.5%NaCl salt solution reaches 260mV.
Claims (2)
1. super martensitic stainless steel is characterized in that said stainless chemical constitution is by mass percentage: C:0 ~ 0.03%, and N:0 ~ 0.03%, S < 0.015%; < 0.020%, < 1%, Mn < 1% for Si for P; Cr:13 ~ 16%, Ni:4 ~ 6%, Mo:1 ~ 2%; Nb:0.05 ~ 0.15%, Ti:0.001 ~ 0.01%, surplus is Fe.
2. the preparation method of super martensitic stainless steel as claimed in claim 1 is characterized in that carrying out according to following steps:
(1) adopt vacuum induction melting to be met the super martensitic stainless steel strand of above-mentioned chemical ingredients area requirement, with the Martensite Stainless Steel strand 1200 ℃ of forge hots, hot rolling in 1100 ℃ ~ 1200 ℃ scopes again;
(2) the super martensitic stainless steel plate after the hot rolling is carried out solution treatment, solid solution temperature is 1050 ℃ ~ 1100 ℃, and the treatment time is 0.5 ~ 1h, carries out normalizing treatment after the solution treatment, and air cooling is to room temperature;
(3) the super martensitic stainless steel plate of the solid solution attitude after utilizing chamber type electric resistance furnace with normalizing treatment is at 550 ℃ ~ 700 ℃ scope tempering 2 ~ 4h, and oil cooling is to room temperature, obtains the super martensitic stainless steel after the temper.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106987783A (en) * | 2017-06-05 | 2017-07-28 | 苏州双金实业有限公司 | A kind of high-strength environment-friendly ductile steel |
| CN109811253A (en) * | 2018-12-21 | 2019-05-28 | 江苏星火特钢有限公司 | A kind of super martensitic stainless steel and its manufacturing process |
| CN111840659A (en) * | 2020-04-30 | 2020-10-30 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN112955576A (en) * | 2018-11-05 | 2021-06-11 | 杰富意钢铁株式会社 | Martensitic stainless steel seamless steel pipe for oil well pipe and method for producing same |
| CN114703343A (en) * | 2022-04-18 | 2022-07-05 | 山西太钢不锈钢股份有限公司 | High-strength and high-toughness super martensitic stainless steel extra-thick plate and heat treatment method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002309349A (en) * | 2001-04-09 | 2002-10-23 | Sumitomo Metal Ind Ltd | Martensitic stainless steel with excellent strength stability |
| CN102086494A (en) * | 2009-12-04 | 2011-06-08 | 中国科学院金属研究所 | High-chromium martensitic heat-resistant steel and manufacturing method thereof |
-
2012
- 2012-03-13 CN CN2012100645869A patent/CN102534419A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002309349A (en) * | 2001-04-09 | 2002-10-23 | Sumitomo Metal Ind Ltd | Martensitic stainless steel with excellent strength stability |
| CN102086494A (en) * | 2009-12-04 | 2011-06-08 | 中国科学院金属研究所 | High-chromium martensitic heat-resistant steel and manufacturing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106987783A (en) * | 2017-06-05 | 2017-07-28 | 苏州双金实业有限公司 | A kind of high-strength environment-friendly ductile steel |
| CN112955576A (en) * | 2018-11-05 | 2021-06-11 | 杰富意钢铁株式会社 | Martensitic stainless steel seamless steel pipe for oil well pipe and method for producing same |
| CN109811253A (en) * | 2018-12-21 | 2019-05-28 | 江苏星火特钢有限公司 | A kind of super martensitic stainless steel and its manufacturing process |
| CN111840659A (en) * | 2020-04-30 | 2020-10-30 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN111840659B (en) * | 2020-04-30 | 2022-02-08 | 中科益安医疗科技（北京）股份有限公司 | High-safety blood vessel support without nickel metal medicine elution and its making method |
| CN114703343A (en) * | 2022-04-18 | 2022-07-05 | 山西太钢不锈钢股份有限公司 | High-strength and high-toughness super martensitic stainless steel extra-thick plate and heat treatment method and application thereof |
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Application publication date: 20120704 |