CN102418050A - Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel - Google Patents
Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel Download PDFInfo
- Publication number
- CN102418050A CN102418050A CN2011104123219A CN201110412321A CN102418050A CN 102418050 A CN102418050 A CN 102418050A CN 2011104123219 A CN2011104123219 A CN 2011104123219A CN 201110412321 A CN201110412321 A CN 201110412321A CN 102418050 A CN102418050 A CN 102418050A
- Authority
- CN
- China
- Prior art keywords
- percent
- steel
- tempered steel
- engineering machinery
- yield strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides hardened and tempered steel with yield strength of 800 MPa for engineering machinery and a production method for the hardened and tempered steel. The hardened and tempered steel comprises the following chemical components in percentage by weight: 0.10 to 0.15 percent of C, 0.10 to 0.40 percent of Si, 1.00 to 1.60 percent of Mn, 0.10 to 0.50 percent of Cr, 0.10 to 0.30 percent of Mo, 0.00 to 0.20 percent of Ni, 0.0010 to 0.0030 percent of B, 0.000 to 0.030 percent of Nb, 0.010 to 0.050 percent of V, 0.010 to 0.020 percent of Ti, 0.010 to 0.050 percent of Alt, less than or equal to 0.020 percent of P and less than or equal to 0.010 percent of S. In the produced hardened and tempered steel of 800 MPa grade for engineering machinery, the plasticity is matched with the toughness well due to the optimization of controlled rolling and controlled cooling process parameters and the adoption of a proper hardening-and-tempering heat treatment process.
Description
Technical field
The present invention relates to a kind of yield strength of 800 MPa grade engineering machinery and use quenched and tempered steel, relate to a kind of working method of this rank steel grade simultaneously, belong to the high-strength steel production technical field.
Background technology
Along with the develop rapidly of China's machine building industry, to engineering machinery with intensity, toughness, plasticity and the weldability of steel require increasingly high; The engineering machinery production is for enhancing productivity, alleviate equipment self-weight and reducing energy consumption, and is increasing with the steel demand for the engineering machinery that intensity rank is higher.
At present, producing high-intensity engineering machinery and use steel, can adopt the kinds of processes mode, is that TMCP technology, controlled rolling and controlled cooling+tempering process are TMCP+ tempering process, controlled rolling and controlled cooling+hardening and tempering process etc. like cooling controlling and rolling controlling process.
Consider from technology controlling and process angle and cost aspect, adopt less operation, favourable to reducing cost.But, if use cooling controlling and rolling controlling process merely, can't guarantee the steel plate overall performance, plate property is inhomogeneous, and the fertile steel grade rank of institute is lower, steel plate thickness specification is also thinner.For improving and improve performance, need to add many alloying elements and need strict controlled rolling processing parameter, can guarantee needed plate quality.Adopt " controlled rolling and controlled cooling+tempering process " directly to adopt the control cooling control technology, can improve and the steel sheet performance; But because of lacking quenching process, tempering front spring intensity is lower slightly, after the tempered processing, possibly have the undercapacity phenomenon, can't production higher level engineering machinery use steel.
Adopt " controlled rolling+hardening and tempering process ", can obviously improve and the steel sheet quality, improve armor plate strength, production higher level engineering machinery is used steel.But for the steel plate of modifier treatment, be intensity behind the assurance quenching and tempering, generally need to add many hardening capacity elements,, cause the quenched and tempered steel cost higher like Cr, Ni, Mo etc.
Consider above-mentioned factor, reducing production costs and guaranteeing that under the prerequisite of plate property, the present invention designs the appropriate ingredients system, for the steel plate of different size, alloy contents such as optimization and adjustment Cr, Ni, Mo; In follow-up rolling and heat treatment process, rationally controlled rolling processing parameter, quenching technology and tempering process parameters, the armor plate strength of being produced, plasticity, toughness coupling are better and more stable.
Summary of the invention
The purpose of this invention is to provide a kind of yield strength of 800 MPa grade engineering machinery with quenched and tempered steel and working method thereof.Through taking reasonable component design, rolling technology and hardening and tempering process, the steel plate of being produced can reach the performance requriements of 800MPa level engineering machinery with quenched and tempered steel fully.
The present invention relates to a kind of yield strength of 800 MPa grade engineering machinery and use quenched and tempered steel, its chemical ingredients is (weight percent), C:0.10%～0.15%; Si:0.10%～0.40%; Mn:1.00%～1.60%; Cr:0.10%～0.50%; Mo:0.10%～0.30%; Ni:0.00%～0.20%; B:0.0010%～0.0030%; Nb:0.000%～0.030%; V:0.010%～0.050%; Ti:0.010%～0.020%; Alt:0.010%～0.050%; P :≤0.020%; S :≤0.010%; Carbon equivalent Ceq (%)=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15≤0.50; All the other are Fe and inevitable impurity.
Carbon: carbon is the important alloying element that guarantees steel plate hardening capacity, also is the important factor of decision carbon equivalent, and intensity, toughness, plasticity and the weldableness of steel all had considerable influence.Carbon content is too high, influences the steel plate welding property, and carbon content is high-temperature resistant tempered unfavorable to steel plate; Carbon content is low excessively, influences the steel plate bulk strength, under the prerequisite that guarantees the required intensity of steel plate of the present invention, and the scope of preferred carbon content: 0.11%～0.14%;
Silicon: the bioelement of deoxidation has certain solution strengthening effect, the too high toughness and the weldableness that can influence steel, the scope of preferred silicone content among the present invention: 0.20%～0.30%;
Manganese: important solution strengthening element in the steel, can reduce transformation temperature, the thinning microstructure substructure is improved toughness when strengthening steel plate; Simultaneously, can improve hardening capacity.If the manganese too high levels is unfavorable to welding and toughness, the scope of preferred manganese content among the present invention: 1.20%～1.40%;
Chromium: increase the hardening capacity of steel, thinning microstructure reduces ductile-brittle transition temperature; Be used with manganese, can improve the hardenability of steel, improve the mechanical property of steel; Chromium is littler than the segregation tendency of manganese, with chromium instead of part manganese, can reduce the segregation of steel plate heart portion, improves the steel plate internal soundness, improves the homogeneity of mechanical property; The scope of preferred chromium content among the present invention: 0.30%～0.50%;
Molybdenum: can significantly increase the hardening capacity and the hardenability of steel, the microstructure of steel improved toughness after refinement was quenched, and improved the temper brittleness of steel, had high-temperature resistant tempered preferably ability, was alloying element necessary in the quenched and tempered steel.But,, under the prerequisite of guaranteed performance, according to actual steel plate thickness, select to add molybdenum less the scope of preferred molybdenum content among the present invention: 0.20%～0.30% for reducing cost because of molybdenum is a kind of valuable alloy;
Nickel: improve the low-temperature flexibility of steel, improve plasticity and high-temperature resistant tempered softening power, help the tissue after the refinement tempering.Nickel also is valuable alloy in, too highly will increase cost, selects to add nickel less the scope of preferred nickel content among the present invention:: 0.10%～0.20%;
Niobium, titanium, vanadium: niobium, titanium all are strong carbon and nitrogen compound forming element, and in the steel billet heating and the operation of rolling, the pinning austenite grain boundary also stops austenite crystal excessively to be grown up; In quenching process, austenite crystal is grown up when hindering the heating of quenching front spring, obtains the tiny axle quenching structure that waits, and improves low-temperature flexibility after the tempering.In drawing process, vanadium is as microalloy element, and deposition is separated out a large amount of carbonitrides, improves the intensity of steel.According to actual needs, the present invention suitably adds niobium, titanium, three kinds of microalloy elements of vanadium.
Boron: the hardening capacity that significantly improves steel compares effective elements, very easily at grain boundary segregation, stops separating out of carbon, and the boron of trace can play tangible effect.But the boron too high levels be prone to form the carbonitride of boron, reduce toughness and cause hot-short, its zone of reasonableness: 0.0010%～0.0020%;
Phosphorus, sulphur: harmful element in the steel, impact toughness is unfavorable; The present invention adopts PURITY STEEL PRODUCTION TECHNOLOGY, reduce as far as possible phosphorus, element sulphur to rigidity can disadvantageous effect.
A kind of yield strength of 800 MPa grade engineering machinery is following with the quenched and tempered steel production stage:
Molten steel is smelted and the slab casting: in smelting process, strict control carbon, phosphorus, sulphur composition also guarantees that carbon equivalent is in span of control; The smelting technology route: desulfurizing iron is skimmed → converter smelting → LF stove refining → RH refining; Strict control casting billet surface and internal soundness in the casting cycle.
Steel plate rolling: steel billet is heated to 1160 ℃～1240 ℃ of design temperatures, guarantees the abundant austenitizing of steel billet; In the operation of rolling, adopt two stages controlled rolling technology, 1170 ± 20 ℃ of rough rolling step start rolling temperatures, roughing end temp >=980 ℃; 900 ℃～950 ℃ of finish rolling stage start rolling temperatures, 800 ℃～850 ℃ of finish rolling end temps; For guaranteeing rolling back steel-plate shape, directly rolling than thin specification steel plate＜25mm employing, rolling back air cooling mode is cooled off; Adopt controlled rolling than thick steel plates >=25mm, roll the back and adopt weak water-cooled, final cooling temperature is provided with slightly high.
Modified thermal treatment: according to the composition system and the complete austenitic temperature of steel plate of different size steel plate; Rationally set 880 ℃～950 ℃ of quenching temperatures and soaking time 10min～40min, 500 ℃～680 ℃ of tempering temperatures and soaking time 10mm～60mm thereof, all the other processes are carried out process furnace heated mould shape parameter.
The present invention uses quenched and tempered steel through the 800MPa level engineering machinery that above-mentioned operation is produced, and steel plate thickness specification covers 8mm～60mm; The steel plate mechanical performance index is more stable; Wherein: go up ys ReH >=800MPa, tensile strength Rm >=850MPa, elongation after fracture A=14%～20% ,-40 ℃ of impact value AKv=95J～260J; The armor plate strength index is good, and plasticity, toughness coupling better.
Description of drawings
Fig. 1 is the metallographic structure of embodiment 12mm specification steel plate typical case tempering attitude.
Fig. 2 is the metallographic structure of embodiment 20mm specification steel plate typical case tempering attitude.
Fig. 3 is the metallographic structure of embodiment 30mm specification steel plate typical case tempering attitude.
Fig. 4 is the metallographic structure of embodiment 40mm specification steel plate typical case tempering attitude.
Fig. 5 is the metallographic structure of embodiment 50mm specification steel plate typical case tempering attitude.
Fig. 6 is the metallographic structure of embodiment 60mm specification steel plate typical case tempering attitude.
Embodiment
The chemical ingredients scope of " 800MPa level engineering machinery is used quenched and tempered steel " according to the present invention; Accomplish steel billet smelting, slab casting, slab specification: 250mm/300mm (steel billet thickness) * 2000mm/2400mm (width of steel billet) * 2700mm～4100mm (steel billet length), steel plate rolling (rolling specs: 12mm, 20mm, 30mm, 40mm, 50mm, 60mm) and modified thermal treatment: quenching and tempering technology at 4300mm Wide and Thick Slab production line.In this instance 800MPa level engineering machinery with the actual chemical ingredients of quenched and tempered steel (wt%) by shown in the table 1:
The actual chemical ingredients of table 1
| Numbering | C | Si | Mn | P | S | Alt | V | Nb | Ti | Ni | Cr | Mo | B | Ceq |
| 1# | 0.14 | 0.21 | 1.39 | 0.012 | 0.004 | 0.028 | 0.032 | 0.012 | 0.10 | 0.29 | 0.16 | 0.0016 | 0.48 | |
| 2# | 0.14 | 0.21 | 1.39 | 0.011 | 0.004 | 0.024 | 0.031 | 0.013 | 0.11 | 0.32 | 0.19 | 0.0020 | 0.49 | |
| 3# | 0.12 | 0.18 | 1.15 | 0.010 | 0.003 | 0.040 | 0.048 | 0.021 | 0.012 | 0.20 | 0.48 | 0.25 | 0.0016 | 0.48 |
| 4# | 0.11 | 0.21 | 1.13 | 0.012 | 0.004 | 0.033 | 0.049 | 0.019 | 0.014 | 0.20 | 0.47 | 0.27 | 0.0014 | 0.47 |
| 5# | 0.11 | 0.23 | 1.21 | 0.014 | 0.005 | 0.037 | 0.045 | 0.023 | 0.015 | 0.18 | 0.51 | 0.30 | 0.0016 | 0.49 |
| 6# | 0.11 | 0.22 | 1.14 | 0.010 | 0.002 | 0.041 | 0.049 | 0.022 | 0.015 | 0.20 | 0.43 | 0.27 | 0.0015 | 0.45 |
The instance rolling technological parameter is provided with as shown in table 2:
The actual rolling technological parameter setting of table 2
Annotate: the H-finished product thickness
Actual hardening and tempering process parameter is provided with as shown in table 3:
The actual hardening and tempering process parameter of table 3 is provided with
Modified back performance statistics value is as shown in table 4:
The modified back of table 4 plate property statistics
Annotate: ReH (going up ys), Rm (tensile strength), A (elongation after fracture), AKv (impact), Min～Max/Ave (minimum value～peak/MV)
Claims (5)
1. a yield strength of 800 MPa grade engineering machinery is used quenched and tempered steel, and its chemical ingredients is (weight percent), C:0.10%～0.15%; Si:0.10%～0.40%; Mn:1.00%～1.60%; Cr:0.10%～0.50%; Mo:0.10%～0.30%; Ni:0.00%～0.20%; B:0.0010%～0.0030%; Nb:0.000%～0.030%; V:0.010%～0.050%; Ti:0.010%～0.020%; Alt:0.010%～0.050%; P :≤0.020%; S :≤0.010%; All the other are Fe and inevitable impurity; Satisfy simultaneously; Carbon equivalent Ceq (%)=C+ (Mn+Mo)/5+ (Cr+Cu)/20+Ni/40≤0.50.
2. yield strength of 800 MPa grade engineering machinery as claimed in claim 1 is used quenched and tempered steel, it is characterized in that: C:0.11%～0.14%; Mn:1.20%～1.40%; Cr:0.30%～0.50%; Mo:0.20%～0.30%; Ni:0.10%～0.20%.
3. according to claim 1 or claim 2 yield strength of 800 MPa grade engineering machinery is used quenched and tempered steel, it is characterized in that: carbon equivalent Ceq (%): 0.45～0.49.
4. production yield strength of 800 MPa grade engineering machinery according to claim 1 or claim 2 is with the method for quenched and tempered steel; Through converter smelting, external refining, RH vacuum-treat, continuous casting, steel billet reheat, controlled rolling, controlled chilling; It is characterized in that: quenching temperature in the quenching process of modified operation: 880 ℃～930 ℃, Quenching Soaking Time 10min～40min; Tempering temperature is 550 ℃～650 ℃ in the drawing process of modified operation, tempering insulation time 10min～60min.
5. according to claim 1 or claim 2 yield strength of 800 MPa grade engineering machinery is used quenched and tempered steel, and the metallographic structure after its modifier treatment is a tempered sorbite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104123219A CN102418050A (en) | 2011-12-12 | 2011-12-12 | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104123219A CN102418050A (en) | 2011-12-12 | 2011-12-12 | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102418050A true CN102418050A (en) | 2012-04-18 |
Family
ID=45942693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104123219A Pending CN102418050A (en) | 2011-12-12 | 2011-12-12 | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102418050A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691000A (en) * | 2012-06-18 | 2012-09-26 | 内蒙古包钢钢联股份有限公司 | Steel plate for engineering machinery and rolling and heat treatment technologies thereof |
| CN104947000A (en) * | 2015-06-14 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | High-strength steel with yield strength of 700MPa and TMCP manufacturing method |
| CN104962834A (en) * | 2015-06-14 | 2015-10-07 | 秦皇岛首秦金属材料有限公司 | High-toughness stable-brinell-hardness extra-thick abrasion-resistant steel and preparation method thereof |
| CN106521354A (en) * | 2016-11-23 | 2017-03-22 | 安徽瑞鑫自动化仪表有限公司 | High temperature resistant alloy steel for temperature sensor and preparation method of high temperature resistant alloy steel |
| CN106544581A (en) * | 2016-09-30 | 2017-03-29 | 秦皇岛首秦金属材料有限公司 | A kind of high-strength container steel of normalizing state nickel-vanadium alloy and its production method |
| CN108165892A (en) * | 2017-11-23 | 2018-06-15 | 南阳汉冶特钢有限公司 | A kind of low-temperature pressure container 35-50mm thickness Q420R high-strength steel and its production method |
| CN109136482A (en) * | 2018-10-16 | 2019-01-04 | 五矿营口中板有限责任公司 | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method |
| CN109972042A (en) * | 2019-04-17 | 2019-07-05 | 北京科技大学 | A kind of yield strength 800MPa grades of Low temperature-resistancorrosion-resistant corrosion-resistant H profile steels and preparation method thereof |
| CN111440984A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
| CN115433872A (en) * | 2022-08-29 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Steel with yield strength of 800MPa grade for rare earth engineering machinery and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000319726A (en) * | 1999-03-11 | 2000-11-21 | Sumitomo Metal Ind Ltd | Manufacture of high strength steel plate excellent in weldability |
| CN102080190A (en) * | 2011-02-14 | 2011-06-01 | 东北大学 | Hardening and tempering steel plate for engineering machinery with 7000MPa grade yield strength and preparation method thereof |
-
2011
- 2011-12-12 CN CN2011104123219A patent/CN102418050A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000319726A (en) * | 1999-03-11 | 2000-11-21 | Sumitomo Metal Ind Ltd | Manufacture of high strength steel plate excellent in weldability |
| CN102080190A (en) * | 2011-02-14 | 2011-06-01 | 东北大学 | Hardening and tempering steel plate for engineering machinery with 7000MPa grade yield strength and preparation method thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691000A (en) * | 2012-06-18 | 2012-09-26 | 内蒙古包钢钢联股份有限公司 | Steel plate for engineering machinery and rolling and heat treatment technologies thereof |
| CN104947000A (en) * | 2015-06-14 | 2015-09-30 | 秦皇岛首秦金属材料有限公司 | High-strength steel with yield strength of 700MPa and TMCP manufacturing method |
| CN104962834A (en) * | 2015-06-14 | 2015-10-07 | 秦皇岛首秦金属材料有限公司 | High-toughness stable-brinell-hardness extra-thick abrasion-resistant steel and preparation method thereof |
| CN106544581A (en) * | 2016-09-30 | 2017-03-29 | 秦皇岛首秦金属材料有限公司 | A kind of high-strength container steel of normalizing state nickel-vanadium alloy and its production method |
| CN106521354A (en) * | 2016-11-23 | 2017-03-22 | 安徽瑞鑫自动化仪表有限公司 | High temperature resistant alloy steel for temperature sensor and preparation method of high temperature resistant alloy steel |
| CN108165892A (en) * | 2017-11-23 | 2018-06-15 | 南阳汉冶特钢有限公司 | A kind of low-temperature pressure container 35-50mm thickness Q420R high-strength steel and its production method |
| CN109136482A (en) * | 2018-10-16 | 2019-01-04 | 五矿营口中板有限责任公司 | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method |
| CN109972042A (en) * | 2019-04-17 | 2019-07-05 | 北京科技大学 | A kind of yield strength 800MPa grades of Low temperature-resistancorrosion-resistant corrosion-resistant H profile steels and preparation method thereof |
| CN111440984A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
| CN115433872A (en) * | 2022-08-29 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Steel with yield strength of 800MPa grade for rare earth engineering machinery and preparation method thereof |
| CN115433872B (en) * | 2022-08-29 | 2024-01-30 | 包头钢铁（集团）有限责任公司 | Steel with yield strength of 800MPa grade for rare earth engineering machinery and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102418050A (en) | Hardened and tempered steel with yield strength of 800 MPa for engineering machinery and production method for hardened and tempered steel | |
| CN101649420B (en) | Ultra-strength, high toughness and low yield ratio steel and steel plate and manufacturing method thereof | |
| WO2016095721A1 (en) | Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor | |
| CN102952994B (en) | Refractory anti-seismic construction steel and production method thereof | |
| CN104947000A (en) | High-strength steel with yield strength of 700MPa and TMCP manufacturing method | |
| CN101948987B (en) | Manufacturing method of high-strength and high-toughness steel plate | |
| CN103014541A (en) | 690MPa thick steel plate for ocean engineering and manufacturing method of steel plate | |
| CN106048417A (en) | Low-alloy high-strength wear-resisting steel plate and production method thereof | |
| CN102286695A (en) | High-plasticity high-toughness and ultra-high-intensity steel plate and production method thereof | |
| CN109252107B (en) | Production method of high-flatness ultrahigh-strength steel | |
| CN103882330A (en) | Non-quenched and tempered steel plate with low yield ratio and super high strength and producing method thereof | |
| CN103014545B (en) | High-strength steel plate with 900 Mpa-level yield strength and preparation method of steel plate | |
| CN102234743A (en) | Low carbon martensite steel plate and production method | |
| CN102605252A (en) | Steel plate with yield strength grade of 1030MPa and manufacturing method thereof | |
| CN100419113C (en) | High-strength deformed steel bar and method of manufacturing same | |
| CN109182669B (en) | High-hardness high-toughness easy-welding pre-hardened plastic die steel and preparation method thereof | |
| CN105239013A (en) | Axle housing steel for cold-machining formation and manufacturing method of axle housing steel | |
| CN102953000B (en) | A kind of ultrahigh-strength steel plates and manufacture method thereof | |
| CN108385034B (en) | LGB-Q & T method for 1000 MPa-grade hydroelectric steel plate with thickness not greater than 100mm | |
| CN102676933A (en) | Low-alloy super-strength high-toughness steel plate and production method thereof | |
| CN102560274A (en) | Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof | |
| CN103014520A (en) | F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof | |
| CN102653846A (en) | Large-thickness easy-to-weld quenched and tempered high-strength steel plate for hydroelectricity and manufacturing method thereof | |
| CN102828124A (en) | Non-quenched/tempered heavy plate for low-temperature pressure vessel and production method thereof | |
| CN104451446B (en) | Thick-gauge, high-strength and high-toughness bainite engineering steel and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120418 |