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A 180-200mm thick alloy structural steel 27simn and its production process

A technology of alloy structural steel and production process, which is applied in the field of iron and steel smelting, can solve the problems of inapplicability, unprovided steel smelting and rolling process, etc., and achieve the effects of improved production process, excellent comprehensive performance and increased strength

Active Publication Date: 2020-12-22
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention patent does not provide the smelting and rolling process of steel, and the heat treatment process is only applicable to samples or parts. Since the hardenability of samples or parts is very different from that of large-thickness steel plates, the obtained microstructure and properties There is a big difference, so this method is not suitable for the production of 180-220mm thick alloy structural steel 27SiMn

Method used

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  • A 180-200mm thick alloy structural steel 27simn and its production process
  • A 180-200mm thick alloy structural steel 27simn and its production process
  • A 180-200mm thick alloy structural steel 27simn and its production process

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Embodiment

[0036] C: 0.28, Si: 1.3, Mn: 1.25, P: 0.015, S≤0.005, B: 0.0009, Ti: 0.025, and the rest are Fe and residual elements.

[0037] The carbon equivalent of the chemical composition is (0.49)%. (Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15).

[0038] a. Converter smelting: The temperature of molten iron entering the furnace is 1320°C, and the Si content of molten iron is 0.3%.

[0039] b. LF refining: 1. Heating time 9 minutes, add 400m long Al wire; 2. Heating time 13 minutes, 3. Heating time 8 minutes, add 120m long Ca wire during slagging process to ensure slagging effect;

[0040] c.VD vacuum treatment: vacuum degree 67Pa, vacuum time 18min;

[0041] d. Mold casting: Before casting, the flow rate of argon blowing is 28NL / min, the time is controlled at 15min, and the casting temperature is controlled at 1555°C. After the casting is completed, heat generating agent is added to the riser, and at the same time, the mold slag and carbonized rice husk are evenly covered;

[0042] e. Heating...

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Abstract

The invention discloses alloy constructional steel 27SiMn with 180-200mm thickness and a manufacturing technology thereof. The alloy constructional steel 27SiMn is prepared from the chemical raw materials in percentage by mass: 0.27-0.30% of C, 1.2-1.4% of Si, 1.2-1.3% of Mn, no more than 0.030% of P, no more than 0.030% of S, 0.0008-0.001% of B, 0.020-0.030% of Ti, and the balance of Fe and residual elements. The manufacturing technology comprises the following steps of converter smelting, LF refining, VD vacuum degassing, die casting, heating, rolling, stacking cooling, and heat processing.The components of the alloy constructional steel 27SiMn are rationally designed, the manufacturing technology is improved, and parameters are accurately controlled, so that the alloy constructional steel 27SiMn with 180-200mm thickness and with a good combination property is obtained, and requirements of customers are better met.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to an alloy structural steel 27SiMn with a thickness of 180-200 mm and a production process thereof. Background technique [0002] As an alloy structural steel, 27SiMn has high strength and wear resistance, high hardenability, good machinability, less toughness reduction during heat treatment, and high toughness can still be maintained during water cooling. Due to the special material and outstanding advantages of 27SiMn, it is widely used in large support forgings of hydraulic cylinders in coal mines, etc., and most of them are used in the state of heat treatment. [0003] The patent with the publication number CN103773927B provides a high-strength toughness 27SiMn steel heat treatment process. The main process flow is: raw material→heating→oil quenching→air cooling→tempering→air cooling; the main process is: fully heat the raw material 27SiMn steel austenitic Afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C33/04C21D8/02C21D1/18C21C7/00C21C7/072B22D7/00
CPCB22D7/00C21C7/0056C21C7/072C21D1/18C21D8/02C22C33/04C22C38/02C22C38/04C22C38/14C22C38/32Y02P10/20
Inventor 朱书成李亮李忠波许少普张涛陈良董真真陈熙袁继恒刘庆波唐郑磊张占杰康文举全微波符可义杨阳于飒庞百鸣郑海明朱先兴袁高俭蒋鹏薛艳生白艺博王英杰袁永旗李嘎子
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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