CN104152653A - 18CrNiWA round steel thermal treatment process - Google Patents
18CrNiWA round steel thermal treatment process Download PDFInfo
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- CN104152653A CN104152653A CN201410364948.5A CN201410364948A CN104152653A CN 104152653 A CN104152653 A CN 104152653A CN 201410364948 A CN201410364948 A CN 201410364948A CN 104152653 A CN104152653 A CN 104152653A
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Abstract
The invention discloses a 18CrNiWA round steel thermal treatment process which comprises the following steps: (1) preserving 20mm of margin when round steel is subjected to hot forging, taking out, heating to be 900-920 DEG C at the speed of 60-80 DEG C/h, keeping the temperature for 2-4 hours, and cooling in air; (2) performing primary thermal treatment, namely, quenching and tempering at 880-900 DEG C, performing oil quenching at minus 20 to minus 40 DEG C, tempering to be 680-700 DEG C, keeping the temperature for 10-16 hours, and cooling in a furnace; (3) hot-forging one more time to be of the forming size; (4) roughly machining; (5) performing secondary thermal treatment, namely, performing gas carburizing treatment at 940-950 DEG C, slowly cooling to be 880-890 DEG C, taking out, and putting into molten nitrate for quenching; (6) tempering, namely, keeping the temperature for 3-6 hours at 140-160 DEG C; (7) finely processing to form a product. The method adopts the treatment method of twice forging and forming and twice thermal treatment, the 18CrNiWA round steel can meet the requirements on hardness, is free of crack and high in surface smoothness, can meet the requirements of customers and is used in heavy load parts with very high requirements on use performance.
Description
Technical field
The invention belongs to forged steel thermal treatment process, be specifically related to 18CrNiWA round steel thermal treatment process.
Background technology
18CrNiWA steel has the low-carbon alloy structural steel of high strength, high tenacity, high-hardenability, it finds broad application in many war products, as multiplex this kind of material manufactures such as the bent axle of marine high-speed diesel, tank engine etc., connecting rod, gear and high-strength bolts, in prior art, the heat treatment hardness of 18CrNiWA steel after forging do not reach requirement, cracking, surface smoothness is not high, does not reach requirement.
Summary of the invention
For addressing the above problem, the invention discloses 18CrNiWA round steel thermal treatment process, in the material that heat treating method processing of the present invention obtains, tissue distribution and crystal grain are thinner, the intensity that has effectively improved low-carbon alloy structural steel, hardness reaches requirement, does not ftracture, surface smoothness is high, reaches customer requirement.
For achieving the above object, technical scheme of the present invention is as follows:
18CrNiWA round steel thermal treatment process, is characterized in that: comprise the following steps:
(1), after round steel stays 20mm surplus to take out more during forge hot, with the speed of 60-80 ℃/h, be heated to 900-920 ℃, insulation 2-4h, air cooling;
(2) thermal treatment for the first time: modified 880-900 ℃, with-20
~-40 ℃ of oil quenchings, tempering 680-700 ℃ soaking time is that after 10-16h, stove is cold;
(3) compact dimensions is once arrived in forge hot again;
(4) cooling rear roughing;
(5) thermal treatment for the second time: gas cementation is processed 940-950 ℃, Slow cooling is to 880-890 ℃, and taking-up is put into the salt made from earth containing a comparatively high percentage of sodium chloride of melting and is quenched;
(6) tempering: 140-160 ℃ of insulation 3-6 hour;
(7) cooling rear precision work moulding.
Material property:
Tensile strength sigma b (MPa): >=947
Yield strength σ s (MPa): >=769
Elongation δ 5 (%): >=13
Relative reduction in area ψ (%): >=46
Impact energy Ak v (J): >=47
Notched bar impact strength α kv (J/cm2): >=58.
The invention has the beneficial effects as follows:
18CrNiWA round steel thermal treatment process of the present invention, adopts twice forging molding, and twice heat treated treatment process makes 18CrNiWA round steel hardness reach requirement, do not ftracture, and surface smoothness is high, normalizing treatment after forging for the first time, for crystal grain and the elimination carbide network of refinement steel, and then carries out modifier treatment, wherein quenches rear with-20
~-40 ℃ of oil quenchings, then high tempering is used for eliminating cold deformation work hardening, and 10-16h is incubated for a long time, can eliminate forging stress, improve machinability, because 18CrNiWA round steel is low-carbon alloy structural steel, steel hardness is low, with modifier treatment, can improve cutting surface smooth finish, after forging for the second time, can improve material hardness, can improve tissue and the performance of cementation zone, make it obtain fine acicular (or cryptocrystal shape) martensite and equally distributed undissolved carbide particle, guarantee that heart portion and top layer all obtain superior performance simultaneously, carburized workpiece after secondary quenching, textura epidermoidea is that fine acicular martensite adds carbide and a small amount of residual austenite that granular small and dispersed distributes, there are higher wear resistance and fatigue strength, heart portion is for fine-grannular ferrite adds perlite or low carbon martensite adds a small amount of tiny ferrite particles, there are higher plasticity and certain intensity, because the present invention is that secondary forges, hardness can reach requirement, do not ftracture, surface smoothness is high, reaches customer requirement, for the exigent heavy lift part of use properties.
Embodiment
Embodiment 1
18CrNiWA round steel thermal treatment process, comprises the following steps:
(1) round steel stays 20mm surplus more during forge hot, after taking-up, with the speed of 70 ℃/h, is heated to 920 ℃, insulation 4h, air cooling;
(2) thermal treatment for the first time: modified 890 ℃, with-25 ℃ of oil quenchings, 690 ℃ of soaking times of tempering are that after 15h, stove is cold;
(3) compact dimensions is once arrived in forge hot again;
(4) cooling rear roughing;
(5) thermal treatment for the second time: gas cementation is processed 940 ℃, Slow cooling to 880 ℃, taking-up is put into the salt made from earth containing a comparatively high percentage of sodium chloride of melting and is quenched;
(6) tempering: 160 ℃ are incubated 5 hours;
(7) cooling rear precision work moulding.
Material property:
Tensile strength sigma b (MPa): 947
Yield strength σ s (MPa): 786
Elongation δ 5 (%): 14
Relative reduction in area ψ (%): 47
Impact energy Ak v (J): 49
Notched bar impact strength α kv (J/cm2): 59.
Embodiment 2
18CrNiWA round steel thermal treatment process, comprises the following steps:
(1), after round steel stays 20mm surplus to take out more during forge hot, with the speed of 80 ℃/h, be heated to 920 ℃, insulation 3h, air cooling;
(2) thermal treatment for the first time: modified 900 ℃, with-40 ℃ of oil quenchings, 680 ℃ of soaking times of tempering are that after 16h, stove is cold;
(3) compact dimensions is once arrived in forge hot again;
(4) cooling rear roughing;
(5) thermal treatment for the second time: gas cementation is processed 950 ℃, Slow cooling to 890 ℃, taking-up is put into the salt made from earth containing a comparatively high percentage of sodium chloride of melting and is quenched;
(6) tempering: 150 ℃ are incubated 4 hours;
(7) cooling rear precision work moulding.
Material property:
Tensile strength sigma b (MPa): 956
Yield strength σ s (MPa): 769
Elongation δ 5 (%): 13
Relative reduction in area ψ (%): 46
Impact energy Ak v (J): 47
Notched bar impact strength α kv (J/cm2): 58.
Claims (1)
1. 18CrNiWA round steel thermal treatment process, is characterized in that: comprise the following steps:
(1), after round steel stays 20mm surplus to take out more during forge hot, with the speed of 60-80 ℃/h, be heated to 900-920 ℃, insulation 2-4h, air cooling;
(2) thermal treatment for the first time: modified 880-900 ℃, with-20
~-40 ℃ of oil quenchings, tempering 680-700 ℃ soaking time is that after 10-16h, stove is cold;
(3) compact dimensions is once arrived in forge hot again;
(4) cooling rear roughing;
(5) thermal treatment for the second time: gas cementation is processed 940-950 ℃, Slow cooling is to 880-890 ℃, and taking-up is put into the salt made from earth containing a comparatively high percentage of sodium chloride of melting and is quenched;
(6) tempering: 140-160 ℃ of insulation 3-6 hour;
(7) cooling rear precision work moulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410364948.5A CN104152653B (en) | 2014-07-29 | 2014-07-29 | 18CrNiWA round steel thermal treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410364948.5A CN104152653B (en) | 2014-07-29 | 2014-07-29 | 18CrNiWA round steel thermal treatment process |
Publications (2)
| Publication Number | Publication Date |
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| CN104152653A true CN104152653A (en) | 2014-11-19 |
| CN104152653B CN104152653B (en) | 2016-04-27 |
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| CN201410364948.5A Active CN104152653B (en) | 2014-07-29 | 2014-07-29 | 18CrNiWA round steel thermal treatment process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404218A (en) * | 2014-12-24 | 2015-03-11 | 江苏隆盛钻采机械制造有限公司 | Heat treatment technique of reducer seat forging |
| CN108716508A (en) * | 2018-08-01 | 2018-10-30 | 广西玉柴机器股份有限公司 | The Steel Crankshafts and its treatment process of the medium-and-large-sized diesel engine of high pressure-charging |
| US10920296B2 (en) | 2016-05-24 | 2021-02-16 | Asustek Computer Inc. | Alloy steel composition and producing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796964A (en) * | 2011-10-10 | 2012-11-28 | 江苏力博士机械股份有限公司 | Novel material of piston of breaking hammer and manufacturing process of piston |
| CN102837165A (en) * | 2012-09-27 | 2012-12-26 | 常熟天地煤机装备有限公司 | Manufacturing method for final-stage driving gear of high-power coal mining machine |
-
2014
- 2014-07-29 CN CN201410364948.5A patent/CN104152653B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796964A (en) * | 2011-10-10 | 2012-11-28 | 江苏力博士机械股份有限公司 | Novel material of piston of breaking hammer and manufacturing process of piston |
| CN102837165A (en) * | 2012-09-27 | 2012-12-26 | 常熟天地煤机装备有限公司 | Manufacturing method for final-stage driving gear of high-power coal mining machine |
Non-Patent Citations (2)
| Title |
|---|
| 唐殿福，卯石刚: "《刚的化学热处理》", 30 March 2009, 辽宁科学技术出版社 * |
| 彭成红: "《机械工程材料综合实验》", 30 September 2012, 华南理工大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404218A (en) * | 2014-12-24 | 2015-03-11 | 江苏隆盛钻采机械制造有限公司 | Heat treatment technique of reducer seat forging |
| US10920296B2 (en) | 2016-05-24 | 2021-02-16 | Asustek Computer Inc. | Alloy steel composition and producing method thereof |
| CN108716508A (en) * | 2018-08-01 | 2018-10-30 | 广西玉柴机器股份有限公司 | The Steel Crankshafts and its treatment process of the medium-and-large-sized diesel engine of high pressure-charging |
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| Publication number | Publication date |
|---|---|
| CN104152653B (en) | 2016-04-27 |
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Address after: 215614 Anqing Village, Fenghuang Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Zhangjiagang general Limited by Share Ltd Address before: 215614 Anqing Village, Fenghuang Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: Zhangjiagang City Guangda Machinery Forging Co., Ltd. |
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