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Forging and heat treatment process of C-Mn high-strength steel forge piece for welding structural part

A welding structure, high-strength steel technology, applied in the improvement of process efficiency, metal processing equipment, sustainable construction, etc., can solve problems such as the inability to meet the high strength of large workpieces, eliminate porosity and segregation, eliminate as-cast structure, The effect of optimizing forging performance

Active Publication Date: 2021-07-09
无锡继平新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional low-alloy structural steel standards only put forward mechanical performance requirements for products with a thickness of less than 120mm. The existing traditional technology can no longer meet the requirements of ensuring high strength for large workpieces as a whole.
For products with large section thickness, there is no requirement for sampling and mechanical properties

Method used

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  • Forging and heat treatment process of C-Mn high-strength steel forge piece for welding structural part
  • Forging and heat treatment process of C-Mn high-strength steel forge piece for welding structural part
  • Forging and heat treatment process of C-Mn high-strength steel forge piece for welding structural part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: A forging and heat treatment process of C-Mn high-strength steel forgings for welded structural parts. The weight percentages of the chemical elements in the forgings are: C: ≤0.18%, Mn: ≤2.0%, P: ≤0.030% , S≤0.025%, Si: ≤0.6%, Cr: ≤0.8%, Ni: ≤0.8%, N: ≤0.015-0.025%, Mo: ≤0.30%, B: ≤0.004%, Als: not less than 0.015, V: 0.01~0.12%, Nb: 0.01~0.11%, Ti: 0.006~0.05, among which Als, V, Nb, Ti can be added alone or in combination, to ensure that the content of at least one alloy element is not less than the specified lower limit, and the balance For Fe and impurities.

[0039] Such as figure 1 As shown, the process includes the following steps:

[0040] Step S1, smelting raw materials to obtain steel ingots. Specifically, raw materials are processed in electric arc furnaces and out-of-furnace refining.

[0041] Step S2, steel ingot forging heating, including: (1), furnace loading: steel ingot charging temperature ≤ 600°C; (2), heating: steel ingot is heated to...

Embodiment 2

[0051] Embodiment 2: A kind of forging and heat treatment process of C-Mn high-strength steel forgings for welded structural parts, and the steps different from Embodiment 1 are:

[0052] Step S3, forging; the forging process includes two firing times:

[0053] (1) First firing: heat the steel ingot to a forging temperature of 1200°C, and then carry out drawing and upsetting in sequence, with a total drawing ratio > 2.5; a total upsetting ratio > 2.2, and ensure that the final forging temperature is ≥ 800°C. After the first firing, put the steel ingot into the forging furnace for heating, the heating temperature is 1190°C; the heating time is positively related to the thickness of the steel ingot, and the steel ingot with a thickness of 200mm is heated for 1 to 1.2 hours.

[0054] (2) The second firing: heat the steel ingot to the forging temperature of 1165°C, then draw the steel ingot and form it by upsetting. After the second fire is completed, the forging is immediately o...

Embodiment 3

[0058] Embodiment 3: A kind of forging and heat treatment process of C-Mn high-strength steel forgings for welded structural parts, and the steps different from Embodiment 1 are:

[0059] Step S3, forging; the forging process includes two firing times:

[0060] (1) The first firing: heat the steel ingot to the forging temperature of 1220°C, and then carry out drawing and upsetting in sequence, with the total drawing ratio > 2.5; the total upsetting ratio > 2.2, and ensure that the final forging temperature is ≥ 800°C. After the first firing, put the steel ingot into the forging furnace for heating, the heating temperature is 1200°C; the heating time is positively related to the thickness of the steel ingot, and the steel ingot with a thickness of 200mm is heated for 1 to 1.2 hours.

[0061] (2) Second firing: heat the steel ingot to a forging temperature of 1180°C, and then draw and upset the steel ingot. After the second fire is completed, the forging is immediately opened a...

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Abstract

The invention discloses a forging and heat treatment process of a C-Mn high-strength steel forge piece for a welding structural part. According to the technical scheme, the forging and heat treatment process of the C-Mn high-strength steel forge piece for the welding structural part is characterized by comprising the following steps: step S1, raw materials are smelted, and a steel ingot is obtained; step S2, forging and heating are performed on the steel ingot; step S3, steel ingot forging is carried out, wherein the forging process comprises two heating numbers: (1) the first heating number: the forging temperature is 1180-1220 DEG C; and (2) the second heating number: the forging temperature is 1150-1180 DEG C; step S4, heat treatment after forging is performed, specifically, (1) forging piece tempering and normalizing are performed; and (2) mechanical rough machining is carried out on the forge piece; and step S5, performance heat treatment is carried out on the forge piece, wherein the performance heat treatment comprises the following steps: (1) quenching and tempering treatment is performed: the forge piece is heated to 900-920 DEG C; and (2) tempering treatment is performed, specifically, the forge piece is heated to the tempering temperature of 480-520 DEG C, and then heat preservation is performed. The invention has the beneficial effects that: by improving the inherent quality of the forge piece, refining grains and improving the heat treatment effect, it is guaranteed that the overall mechanical performance of the product is improved, structure non-uniformity is eliminated, and various performance indexes are greatly provided.

Description

technical field [0001] The invention relates to the field of forging processing, in particular to a forging and heat treatment process of C-Mn high-strength steel forgings for welded structural parts. Background technique [0002] Low-alloy high-strength steel has the characteristics of low cost, high strength, easy welding, and easy processing. Widely used in automobile manufacturing, building structure and marine engineering and other fields. With the continuous development of modern science and technology, higher requirements are placed on the mechanical properties and organizational uniformity of large-scale components in design. [0003] With the maturity of domestic wind power technology, the power of wind turbine assembly machines is also increasing, which means that the equipment structure is constantly increasing. For towers with a height of 140 meters or more, crawler cranes or special lifting ships with a capacity of more than 1,000 tons must be used. Such equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58B21J5/00C21D1/28C21D6/00C21D7/13
CPCC22C33/04C21D7/13C21D6/005B21J5/002C21D1/28C22C38/02C22C38/04C22C38/06C22C38/44C22C38/54C22C38/001C22C38/58C22C38/50C22C38/48C22C38/46Y02P10/20
Inventor 张晶
Owner 无锡继平新材料科技有限公司
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