CN106480367A - A kind of production method of high-strength cold-formed automobile axle housing steel - Google Patents
A kind of production method of high-strength cold-formed automobile axle housing steel Download PDFInfo
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- CN106480367A CN106480367A CN201510538648.9A CN201510538648A CN106480367A CN 106480367 A CN106480367 A CN 106480367A CN 201510538648 A CN201510538648 A CN 201510538648A CN 106480367 A CN106480367 A CN 106480367A
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Abstract
The invention discloses a kind of production method of high-strength cold-formed automobile axle housing steel, this steel grade smelting component percentage by weight is C 0.09-0.12, Si 0.10-0.35, Mn 1.45-1.55, P 0-0.018, S 0-0.006, Nb 0.029-0.038, V 0.035-0.04, Al 0.015-0.04, Ti 0.015-0.035；Process Route Planning is：Desulfurizing iron pretreatment-converter-LF- continuous casting and hot rolling rolling；Wherein the continuous casting steel degree of superheat controls at 15 DEG C～28 DEG C, and pulling speed of continuous casting controls in 1.0m/min～1.15m/min, permanent casting speed continuous casting, plate blank coarse micro-grain sampling inspection center segregation≤C 0.5；Technique is controlled to carry out hot rolling using thermomechanical, firing rate controls in 10cm/min, guarantee 40min soaking time, using two-stage control rolling, the recrystallization zone rolling of one stage depresses broken column crystal using big, and by recrystallization softening crystal grain, two-stage start rolling temperature is less than non-recrystallization temperature, i.e. finishing temperature is higher than Ar3+20 DEG C, and after rolling, steel plate is quickly cooled down further thinning microstructure crystal grain by ACC device.
Description
Technical field
The present invention relates to a kind of production method of high-strength cold-formed automobile axle housing steel.
Background technology
Drive axle housing is one of strength member of medium and heavy commercial car, axle housing not only supports the gross mass of below vehicle frame and vehicle frame in vehicle traveling process, and transfer load to wheel, act on the pull strength in driving moment, brake force, side force and method phase power to be delivered on suspension, vehicle frame and compartment by axle housing, therefore axle housing is load bearing element, it is also force transferring part, it is also main reducing gear, differential mechanism and drives planning to discuss the shell of actuating device simultaneously, and therefore axle housing non-deformability is stronger.The making form of axle housing has two kinds：Iron casting molding, use steel plate punched welding fabrication.Due to steel plate welding fabrication be easy to processing, intensity high, lightweight, be increasingly becoming the main version of axle housing at present.
Produce press welding axle housing, need very large-tonnage pressing equipment, be limited to investment problem, can only take hot-forming, material is possible to cause skin decarburization in heating, is unfavorable for the fatigue strength of axle housing.Now, with the progress of material technology, process equipment, cold stamping axle housing is progressively promoted.In use, the shape of axle housing and construction featuress require armor plate strength high, and clod wash and drawing and forming are good, and have excellent welding characteristic.The special steel grade of domestic axle housing only has the minority manufacturer production such as Wuhan Iron and Steel Plant, Baosteel.
Content of the invention
It is an object of the invention to provide a kind of production method of high-strength cold-formed automobile axle housing steel, not only can guarantee that the mechanical property of product, and by adding the element microalloying such as a small amount of Nb, V, crystal grain thinning is achieved by hot rolling cooling controlling and rolling controlling process, makes product possess higher intensity and preferable toughness.
The object of the present invention is achieved like this, a kind of production method of high-strength cold-formed automobile axle housing steel, this steel grade is with C-Mn alloy as matrix, add micro Nb, V, Ti alloying element, the smelting component percentage by weight of product is C 0.09-0.12, Si 0.10-0.35, Mn 1.45-1.55, P 0-0.018, S 0-0.006, Nb 0.029-0.038, V 0.035-0.04, Al 0.015-0.04, Ti 0.015-0.035；Process Route Planning is：Desulfurizing iron pretreatment-converter-LF- continuous casting and hot rolling rolling；Wherein the continuous casting steel degree of superheat controls at 15 DEG C～28 DEG C, 20 DEG C of target, and pulling speed of continuous casting controls in 1.0m/min～1.15m/min, target 1.1 m/min perseverance casting speed continuous casting, plate blank coarse micro-grain sampling inspection center segregation≤C 0.5；Technique is controlled to carry out hot rolling using thermomechanical, firing rate controls in 10cm/min, guarantee 40min soaking time, from hot-rolling heating furnace out temperature is extracted for the thick slab of 2.5-6.99mm and is not less than 1170 DEG C～1220 DEG C, 850 DEG C of finishing temperature, coiling temperature is 610 DEG C, from hot-rolling heating furnace out temperature is extracted for the thick slab of 7.0-12.0mm and is not less than 1160 DEG C～1210 DEG C, 860 DEG C of finishing temperature, coiling temperature is 580 DEG C, and refrigerating mode is 4/7；Using two-stage control rolling, the recrystallization zone rolling of one stage depresses broken column crystal using big, by recrystallization softening crystal grain, two-stage start rolling temperature is less than non-recrystallization temperature, i.e. finishing temperature is higher than Ar3+20 DEG C, and after rolling, steel plate is quickly cooled down further thinning microstructure crystal grain by ACC device.
Nearly 400 tons of hot-rolled coils are produced altogether using the inventive method, the indexs such as the mechanical properties such as tensile strength, yield strength, elongation percentage, impact, cold roll forming, welding carbon equivalent all reach technical protocol requirement, after product is used for being fabricated to in-between car vehicle bridge, user uses rear satisfaction.The inventive method not only can guarantee that the mechanical property of product, and by adding the element microalloying such as a small amount of Nb, V, achieve crystal grain thinning by hot rolling cooling controlling and rolling controlling process, make product possess higher intensity and preferable toughness.The mechanical property of the 10mm heavy slab being produced using the inventive method is as follows：
Specific embodiment
A kind of production method of high-strength cold-formed automobile axle housing steel, taking produce this thick steel grade product of 10mm as a example, this steel grade is with C-Mn alloy as matrix, add micro Nb, V, Ti alloying element, the smelting component percentage by weight of product is C 0.09, Si 0.15, Mn 1.5, P 0.018, S 0.003, Nb 0.032, V 0.035, Al 0.02, Ti 0.018；Process Route Planning is：Desulfurizing iron pretreatment-converter-LF- continuous casting and hot rolling rolling；The wherein continuous casting steel degree of superheat（Molten steel in bakie in continuous casting temperature is referred to as the Metal in Tundish degree of superheat with the difference of the liquidus temperature of this steel grade）Control at 20 DEG C, pulling speed of continuous casting controls in 1.1 m/min perseverance casting speed continuous castings, plate blank coarse micro-grain sampling inspection center segregation≤C 0.5；Technique is controlled to carry out hot rolling using thermomechanical, firing rate controls in 10cm/min it is ensured that 40min soaking time, slab is extracted temperature out from hot-rolling heating furnace and is 1180 DEG C, 860 DEG C of finishing temperature, and coiling temperature is 580 DEG C, and refrigerating mode is 4/7；Using two-stage control rolling, the recrystallization zone rolling of one stage depresses broken column crystal using big, by recrystallization softening crystal grain, two-stage start rolling temperature is less than non-recrystallization temperature, i.e. finishing temperature is higher than Ar3+20 DEG C, and after rolling, steel plate is quickly cooled down further thinning microstructure crystal grain by ACC device.
Claims (1)
1. a kind of production method of high-strength cold-formed automobile axle housing steel, it is characterized in that this steel grade is with C-Mn alloy as matrix, add micro Nb, V, Ti alloying element, the smelting component percentage by weight of product is C 0.09-0.12, Si 0.10-0.35, Mn 1.45-1.55, P 0-0.018, S 0-0.006,
Nb 0.029-0.038、 V 0.035-0.04、Al
0.015-0.04、Ti 0.015-0.035；Process Route Planning is：Desulfurizing iron pretreatment-converter-LF- continuous casting and hot rolling rolling；Wherein the continuous casting steel degree of superheat controls at 15 DEG C～28 DEG C, 20 DEG C of target, and pulling speed of continuous casting controls in 1.0m/min～1.15m/min, target 1.1 m/min perseverance casting speed continuous casting, plate blank coarse micro-grain sampling inspection center segregation≤C 0.5；Technique is controlled to carry out hot rolling using thermomechanical, firing rate controls in 10cm/min, guarantee 40min soaking time, from hot-rolling heating furnace out temperature is extracted for the thick slab of 2.5-6.99mm and is not less than 1170 DEG C～1220 DEG C, 850 DEG C of finishing temperature, coiling temperature is 610 DEG C, from hot-rolling heating furnace out temperature is extracted for the thick slab of 7.0-12.0mm and is not less than 1160 DEG C～1210 DEG C, 860 DEG C of finishing temperature, coiling temperature is 580 DEG C, and refrigerating mode is 4/7；Using two-stage control rolling, the recrystallization zone rolling of one stage depresses broken column crystal using big, by recrystallization softening crystal grain, two-stage start rolling temperature is less than non-recrystallization temperature, i.e. finishing temperature is higher than Ar3+20 DEG C, and after rolling, steel plate is quickly cooled down further thinning microstructure crystal grain by ACC device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510538648.9A CN106480367A (en) | 2015-08-28 | 2015-08-28 | A kind of production method of high-strength cold-formed automobile axle housing steel |
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| CN201510538648.9A CN106480367A (en) | 2015-08-28 | 2015-08-28 | A kind of production method of high-strength cold-formed automobile axle housing steel |
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| CN106480367A true CN106480367A (en) | 2017-03-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385136A (en) * | 2017-06-15 | 2017-11-24 | 宝钢集团新疆八钢铁有限公司 | Axle housing steel BQK580 precipitate control methods |
| CN108296463A (en) * | 2017-10-26 | 2018-07-20 | 新疆八钢铁股份有限公司 | The method for controlling the continuous casting production degree of superheat |
| CN110961456A (en) * | 2019-12-28 | 2020-04-07 | 新疆八一钢铁股份有限公司 | Low-cost 550MpaX70 hot rolling production method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864384A (en) * | 2012-08-31 | 2013-01-09 | 中国重汽集团济南动力有限公司 | High-strength automobile axle housing material and method for manufacturing axle housing |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| CN104480389A (en) * | 2015-01-05 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled band for automotive axle housing and manufacturing method thereof |
| CN104911476A (en) * | 2015-07-10 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel and preparation method and use thereof |
-
2015
- 2015-08-28 CN CN201510538648.9A patent/CN106480367A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864384A (en) * | 2012-08-31 | 2013-01-09 | 中国重汽集团济南动力有限公司 | High-strength automobile axle housing material and method for manufacturing axle housing |
| CN103088257A (en) * | 2013-01-16 | 2013-05-08 | 吉林大学 | High-strength steel for automobile transmission shaft axle tube |
| CN104480389A (en) * | 2015-01-05 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled band for automotive axle housing and manufacturing method thereof |
| CN104911476A (en) * | 2015-07-10 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel and preparation method and use thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385136A (en) * | 2017-06-15 | 2017-11-24 | 宝钢集团新疆八钢铁有限公司 | Axle housing steel BQK580 precipitate control methods |
| CN108296463A (en) * | 2017-10-26 | 2018-07-20 | 新疆八钢铁股份有限公司 | The method for controlling the continuous casting production degree of superheat |
| CN108296463B (en) * | 2017-10-26 | 2021-01-01 | 新疆八一钢铁股份有限公司 | Method for controlling superheat degree of continuous casting tundish |
| CN110961456A (en) * | 2019-12-28 | 2020-04-07 | 新疆八一钢铁股份有限公司 | Low-cost 550MpaX70 hot rolling production method |
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Effective date of registration: 20180724 Address after: 830022 No. 1 Bayi Road, Toutun River District, Urumqi, the Xinjiang Uygur Autonomous Region Applicant after: Xinjiang Bayi Iron & Steel Co., Ltd. Address before: 830022 No. 1 Bayi Road, Toutun River District, Urumqi, the Xinjiang Uygur Autonomous Region Applicant before: Baosteel Group Xinjiang Bayi Iron & Steel Co., Ltd. |
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