CN101591754B - High-obdurability low-alloy cold stamping die steel and hot chemical treatment process - Google Patents
High-obdurability low-alloy cold stamping die steel and hot chemical treatment process Download PDFInfo
- Publication number
- CN101591754B CN101591754B CN2009101042265A CN200910104226A CN101591754B CN 101591754 B CN101591754 B CN 101591754B CN 2009101042265 A CN2009101042265 A CN 2009101042265A CN 200910104226 A CN200910104226 A CN 200910104226A CN 101591754 B CN101591754 B CN 101591754B
- Authority
- CN
- China
- Prior art keywords
- percent
- die
- die steel
- temperature
- coating
- 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.)
- Expired - Fee Related
Links
Abstract
The invention provides a high-obdurability low-alloy cold stamping die steel and a hot chemical treatment process, and relates a die steel and a hot chemical treatment process technique. The die steel comprises the following chemical components in percentage by weight: 0.6 to 0.7 percent of C, 0.8 to 1.1 percent of Cr, 1.00 to 1.30 percent of Mn, 0.4 to 0.8 percent of Si, 0.3 to 0.5 percent of Mo, 0.12 to 0.22 percent of V, 0.03 to 0.05 percent of Nb, less than or equal to 0.025 percent of S, less than or equal to 0.025 percent of P, and the balance of Fe. The hot chemical treatment process comprises the following steps: performing TD-VC treatment on a processed die in a salt bath furnace until the thickness of a coating layer is between 30 and 50 mu m, then performing oil quenching directly, and performing coating treatment at a temperature of between 200 and 350 DG C for 2 to 4 hours; and heating the processed die in a quenching furnace until the detection hardness HRC is more than or equal to 62, then performing pulse ion nitriding in a nitriding furnace until the nitriding thickness is between 200 and 400 mu m, performing surface composite coating treatment until the thicknessof the coating layer is between 20 and 40 mu m, and coping the die. The die has the advantages of low cost, good processability, good weldability, easy restoration, good obdurability and difficult flaking off, and the service life of the die is improved by more than one time.
Description
One, technical field
The present invention relates to die steel and hot chemical treatment process technology, the high-strong toughness used of high-strength vehicle body structural member drawing especially, high performance-price ratio, the low-alloy cold stamping die steel of low cost of manufacture and hot chemical treatment process technology.
Two, background technology
Developing of automobile industry, increasing of auto output, the increase of recoverable amount, only Chinese automobile output in 2008 is near 9,500,000, and automobile pollution has reached 6,000 ten thousand, has brought oil consumption, safety, environmental protection three big problems, and the automobile lightweight is the important channel that solves oil consumption and environmental protection, the every loss of weight 10% of passenger car, but fuel-economizing 6～8%, discharging reduces 3～4%.But lightweight can not have influence on car safety, therefore must adopt high-strength material, adopts high-strength steel.The application of high-strength steel causes die wear serious, and the life-span descends, and the die surface state also can influence the decline of stamping parts surface quality simultaneously.And die cost generally accounts for the cost of stamping parts is 5～18%.How improving die quality, improve die life and wear resistance, is one of important technology of using high-strength steel.
High-strength vehicle stamping parts mould adopts SKD11 or the manufacturing of Cr12MoV material usually.All be lower than 100,000 the work-ing life of at present most of this class mould, and only be about 50,000 each work-ing life of repairing.Adopt Cr12MoV, alloy amount height, it is poor to forge hot-work and cold-forming property, be prone in the use peel off, built-up welding, repair difficulty, and the price of steel product height.Therefore, press for cold-punching mold steel a kind of high-strong toughness, excellent machinability, high performance-price ratio, satisfy the growth requirement of developing of automobile industry the high-strength vehicle stamping parts.
Three, summary of the invention
The objective of the invention is to adopt a kind of high-obdurability low-alloy cold stamping die steel, its alloying constituent is simple, and alloy content is low, Nb, the V combined microalloying after thermochemical treatment, has the compact grained characteristics, hot-work and cold-forming property are good, and it is convenient to repair, and cost is low.
The technical scheme that purpose of the present invention adopted is: the chemical component weight per-cent of the low-alloy cold stamping die steel of its high-strong toughness is: C 0.6～0.7, Cr 0.8～1.1, Mn 1.00～1.30, Si0.4～0.8, Mo 0.3～0.5, and V 0.12～0.22, Nb 0.03～0.05, S≤0.025, P≤0.025, all the other are Fe.Tool steel metallurgical technology rules are smelted routinely, smelt the steel ingot that casting makes, and forge or rolling, heats 1180 ± 20 ℃, and the beginning forges or start rolling temperature＞1100 ℃, and finish-forging or finishing temperature be 〉=900 ℃, forge or roll after slow cooling, the formation blank.
The present invention, blank is machined into mould through routine, the mould that processes is carried out surface strengthening in salt bath furnace liquid infiltrates vanadium carbide and handles (TD-VC processing), and temperature is 900～940 ℃, soaking time＞1.5 hour, thick coating is 30 ~ 50um, directly oil quenching then, handle in the compound coating of 200～350 ℃ of non-balance magnetically controlled sputters oil temperature＜80 ℃ again, coating is TiCr (C, N), and the coating treatment time is 2～4 hours.
The present invention is machined into mould with blank through routine, and the mould that processes is heated in quenching furnance, soaking time＞1.5 hour, oil quenching then, oil temperature＜80 ℃, detect hardness HRC 〉=62, in nitriding furnace, carry out the pulse ion nitrogenize then, 400～490 ℃ of temperature, 5～8 hours time, nitrogenize thickness 200～400um carries out the compound coating of surperficial non-balance magnetically controlled sputter again and handles, and coating is TiCr (C, N), 200～350 ℃ of temperature, coat-thickness are 20～40um; After the reconditioning, can come into operation.
Price of steel product of the present invention only be Cr12MoV (or SKD11) price 1/2, die manufacturing cost is reduced significantly, because its good processability, and processing charges is low, the weldability of mould is good, easily repairs, and the obdurability of mould is good, incrust, can bring up to more than 1 times of Cr12MoV mean life.
Four, specific implementation method
Further specify the present invention below in conjunction with an example.
Smelt by general purpose tool steel metallurgical technology rules, the steel ingot after smelting casting electricity consumption liquid hammer again carries out forging, makes the die steel blank, during forging: heat 1180 ± 20 ℃, initial forging temperature＞1100 ℃, final forging temperature be 〉=900 ℃, forging slow cooling afterwards.Its die steel blank chemical component weight per-cent is: C 0.66, and Cr 0.85, and Mn 1.16, and Si 0.65, and Mo 0.4, and V 0.16, and Nb 0.04, and S 0.005, and P 0.012, and all the other are Fe.Take a sample from blank, heat-treat 920 ℃ of oil quenchings, 200 ℃ of tempering by following technology.The mechanical property of its material is: σ
0.21900MPa, σ
b2200MPa, δ
55.0%, Ψ 25%.Above-mentioned die steel blank is machined into mould through routine, and this steel grade is a low-alloy die steel, so does not need anneal before its processing.
The mould that processes has two kinds of hot chemical treatment process:
First kind of hot chemical treatment process is, the liquid that the mould that processes is carried out surface strengthening in salt bath furnace infiltrates vanadium carbide processing (TD-VC processing), temperature is 930 ℃, soaking time 1.5 hours, and thick coating is 40um, go direct quenching (in the 20# machinery oil) then, handle in 300 ℃ of compound coatings that carry out non-balance magnetically controlled sputter oil temperature＜80 ℃ again, and coating is TiCr (C, N), the centre hardness of mould is HRC57, and surface hardness is HV3200.This class mould is used for the door B post of punching press DP600 or DP780 high strength dual phase steel plate, mould once repair a die work-ing life＞100,000.50,000 of mean lives that are higher than Cr12MoV.
Another kind of hot chemical treatment process is, the mould that processes heated in quenching furnance, and the mould of inserting of opposite house B post, its heat tracing time is 1.5 hours, in the 80 ℃ of machinery oil of quenching then; Detect hardness HRC65, in nitriding furnace, carry out the pulse ion nitrogenize then, 480 ℃ of temperature, 5 hours time, nitrogenize thickness 200um handles in 300 ℃ of compound coatings that carry out non-balance magnetically controlled sputter again, coating is TiCr (C, N),, with manually carrying out reconditioning.The centre hardness of mould is HRC47, and surface hardness is HV3000, and being used for punching press tensile strength is the dual phase steel DP600 door B post of 600MPa, and nearly 100,000 times of die life is higher than mean life of Cr12MoV.
Claims (4)
1. high-obdurability low-alloy cold stamping die steel, it is characterized in that: die steel chemical component weight per-cent is: C 0.6～0.7, Cr 0.8～1.1, and Mn 1.00～1.30, and Si 0.4～0.8, Mo 0.3～0.5, V 0.12～0.22, and Nb 0.03～0.05, S≤0.025, P≤0.025, all the other are Fe.
2. a kind of high-obdurability low-alloy cold stamping die steel according to claim 1, it is characterized in that: tool steel metallurgical technology rules are smelted routinely, smelt the steel ingot that casting makes, forge or rolling, heat 1180 ± 20 ℃, the beginning forges or start rolling temperature＞1100 ℃, and finish-forging or finishing temperature are 〉=900 ℃, forge or roll the back slow cooling, form blank.
3. the hot chemical treatment process of a kind of high-obdurability low-alloy cold stamping die steel according to claim 1 and 2, it is characterized in that: blank is machined into mould through routine, the liquid that the mould that processes is carried out surface strengthening in salt bath furnace infiltrates vanadium carbide processing (TD-VC processing), temperature is 900～940 ℃, soaking time＞1.5 hour, thick coating is 30～50um, directly oil quenching then, oil temperature＜80 ℃, handle in the compound coating of 200～350 ℃ of non-balance magnetically controlled sputters again, coating is TiCr (C, N), the coating treatment time is 2～4 hours.
4. the hot chemical treatment process of a kind of high-obdurability low-alloy cold stamping die steel according to claim 1 and 2, it is characterized in that: blank is machined into mould through routine, the mould that processes is heated in quenching furnance, soaking time＞1.5 hour, oil quenching then, oil temperature＜80 ℃, detect hardness HRC 〉=62, in nitriding furnace, carry out the pulse ion nitrogenize then, 400～490 ℃ of temperature, 5～8 hours time, nitrogenize thickness 200～400um carries out the compound coating of surperficial non-balance magnetically controlled sputter again and handles, and coating is TiCr (C, N), 200～350 ℃ of temperature, coat-thickness are 20～40um; After the reconditioning, can come into operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101042265A CN101591754B (en) | 2009-07-01 | 2009-07-01 | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101042265A CN101591754B (en) | 2009-07-01 | 2009-07-01 | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101591754A CN101591754A (en) | 2009-12-02 |
| CN101591754B true CN101591754B (en) | 2011-02-16 |
Family
ID=41406629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101042265A Expired - Fee Related CN101591754B (en) | 2009-07-01 | 2009-07-01 | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101591754B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407236B (en) * | 2010-09-20 | 2014-01-15 | 宝山钢铁股份有限公司 | Machining and manufacturing method of steel plate of die steel |
| CN102848546A (en) * | 2012-09-12 | 2013-01-02 | 章鹏 | Cylinder used in double-screw extruder, and manufacturing method thereof |
| CN102877071A (en) * | 2012-09-25 | 2013-01-16 | 黄遥泉 | Novel heat chemical treatment process for TD punch |
| CN105463312A (en) * | 2015-12-28 | 2016-04-06 | 合肥中澜新材料科技有限公司 | Preparation method for anti-scratch automobile sound-reducing box |
| CN107217203A (en) * | 2017-04-12 | 2017-09-29 | 滁州市东华模具制造有限公司 | A kind of preparation method of steel wheel hub cold punching die |
| CN108505032A (en) * | 2018-02-28 | 2018-09-07 | 南京江联焊接技术有限公司 | A method of it repairs and reinforcing crankshafts forging mold surface |
| CN109797304A (en) * | 2019-01-28 | 2019-05-24 | 上海钰灏新材料科技有限公司 | Preparation method and its hot-work steel material through gas nitriding processing |
| CN110394606B (en) * | 2019-08-13 | 2022-05-27 | 德州豪沃机械制造有限公司 | Aluminum alloy beam assembly machining process |
| CN113957383B (en) * | 2021-11-02 | 2023-12-29 | 上海欧希帝涂料有限公司 | Corrosion-resistant treatment method for metal surface |
| CN114561516B (en) * | 2022-02-09 | 2023-12-26 | 浙江瑞强汽车部件有限公司 | High-strength guide locking bolt for driving wheel axle and manufacturing method thereof |
-
2009
- 2009-07-01 CN CN2009101042265A patent/CN101591754B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101591754A (en) | 2009-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101591754B (en) | High-obdurability low-alloy cold stamping die steel and hot chemical treatment process | |
| CA2832894C (en) | Steel sheet for hot stamping member and method of producing same | |
| CN101492787B (en) | Medium-high-carbon microalloy non-hardened and tempered steel and controlled forging and cooling process | |
| EP3260569A1 (en) | Steel plate used for hot stamping forming, forming process of hot stamping and hot-stamped component | |
| JP2019035149A (en) | Process for manufacturing steel sheets for press hardening, and parts obtained by means of this process | |
| CN107419185B (en) | A kind of cold-rolled steel sheet and production method with excellent phosphorus characteristic | |
| TWI475112B (en) | Steel plate, plated steel plate, and method of manufacturing the same | |
| CN111926248B (en) | Ce alloy-added hot stamping forming steel and hot stamping forming process | |
| CN101481780A (en) | Easy-to-weld superfine austenite crystal steel with superhigh intensity and high tenacity and manufacturing method thereof | |
| MXPA97008775A (en) | Process to produce steel pipe without seams of great strength having excellent resistance to the fissure by tensions by sulf | |
| CN108160741A (en) | Press part steel alloy wire rod preparation method, press part and its hardening and tempering process | |
| WO2011076383A1 (en) | High strength hot dip galvanised steel strip | |
| CN113832407B (en) | Preparation method of thick hot forming steel, hot rolled steel plate and hot forming steel | |
| CN106756495A (en) | A kind of 1760MPa superelevation strong anti-bullet steel and its manufacture method | |
| CN106392507A (en) | Forging process for reverse driven gear for automobile gearbox | |
| CN109759779A (en) | A kind of non-hardened and tempered steel motor shaft and its processing method | |
| CN113846266A (en) | Production method of high-ductility and toughness quenched and tempered steel plate with yield strength of 1300MPa | |
| CN115087755A (en) | Hot press molded article | |
| CN111763883A (en) | Steel for hollow stabilizer bar and production method thereof | |
| CN113846272B (en) | Hot rolling preparation method of 1700MPa grade high Cr-Si thin-specification hot forming steel | |
| CN110846570A (en) | High-toughness Q460-grade high-strength steel plate and manufacturing method thereof | |
| CN116144909A (en) | Non-quenched and tempered steel motor shaft and preparation method and application thereof | |
| CN116200655A (en) | Antioxidant hot-forming steel and production method thereof | |
| CN112342350B (en) | Production method of high-strength and high-toughness thick steel plate | |
| CN115323252A (en) | Ultrahigh-strength high-plasticity medium manganese steel and preparation 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 | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20200701 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |