High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640

王宁涛; 阮士朋; 段路昭; 王利军

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High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640

更新时间：2026-01-21

- High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640
- Special Steel Vol. 39, Issue 1, Pages: 68-70(2018)
- 作者机构：
  
  1. 河北省线材工程技术研究中心,邢台,054027
  2. 邢台钢铁有限责任公司,邢台,054027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：15 August 2017，
  
  Online First：01 July 2022，
  
  Published：01 July 2018
- 稿件说明：
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王宁涛, 阮士朋, 段路昭, et al. High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640[J]. Special Steel, 2018, 39(1): 68-70.
DOI：

王宁涛, 阮士朋, 段路昭, et al. High Temperature Mechanical Properties of 280mm x 325mm Casting Bloom of Alloy Steel SAE8640[J]. Special Steel, 2018, 39(1): 68-70. DOI：

摘要

采用Gleeble 1500热模拟试验机对SAE8640钢280mm×325mm连铸坯（/% : 0.41C，0.20Si，0.80Mn，0.005S，0.014P，0.46Cr，0.43Ni，0.21Mo，0.043Alt，0.0011O，0.0054N）的550~1200℃力学性能进行了测定

并应用扫描电镜观察了拉力试样的断口形貌。结果表明

SAE8640钢有明显的3个脆性区:Ⅰ脆性区＞1200℃

Ⅱ脆性区950~1000℃

Ⅲ脆性区650~750℃;该钢950~1000℃的断面收缩率为60%

拉伸断口为脆性河流状花样

应避免在该温度范围进行轧制

该钢650~750℃的断面收缩率≥65%

拉伸断口为韧性断裂

可满足连铸坯矫直时塑性的要求。

Abstract

The mechanical properties of steel SAE8640 280mm x 325mm casting bloom (/% : 0.41C

0.20Si

0.80Mn

0.005S

0.014P

0.46Cr

0.43Ni

0.21Mo

0.043All

0.0011O

0.0054N) at 550~1200℃ has been measured by using Gleeble 1500 thermal simulation machine

and the morphology of fracture of tensile specimen is observed by scanning electron microscope. Results show that the steel SAE8640 has obvious 3-brittle zone： I brittle zone ＞1200℃

II brittle zone 950~1000°C and Ⅲ brittle zone 650~750℃；the reduction of area of steel at 950〜1000°C is 60% and the morphology of tensile fracture is mainly river pattern type fracture

it should be avoid rolling at this temperature range； and the reduction of area of steel at 650~750 °C is ≥65%

the tensile fracture is tough fracture to meet the requirement on plasticity of casting bloom in straightening process.

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