Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts

王海华; 郑晓伟; 张剑锋; 林再勇; 孔祥伟

doi:10.20057/j.1003-8620.2022-00075

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Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts

更新时间：2026-01-21

- Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts
- Special Steel Vol. 44, Issue 2, Pages: 33-36(2023)
- 作者机构：
  
  江阴兴澄特种钢铁有限公司线材研究所，江阴,214429
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2022-00075
  CLC：
- Received：29 June 2022，
  
  Online First：27 March 2023，
  
  Published：27 March 2023
- 稿件说明：
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王海华, 郑晓伟, 张剑锋, et al. Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts[J]. Special Steel, 2023, 44(2): 33-36.
DOI：

王海华, 郑晓伟, 张剑锋, et al. Development of Hot-Rolled Wire Rods of 35CrMo Annealing-Free Cold Heading Steel for High-Strength Bolts[J]. Special Steel, 2023, 44(2): 33-36. DOI： 10.20057/j.1003-8620.2022-00075.

摘要

通过入减定径温度780℃

入减定径减面率42%(φ18.4 mm→ φ14 mm)

冷却速度0.42℃/s

35CrMo钢热轧材显微组织为F+P

铁素体含量≥40%

实际晶粒度10～11级，抗拉强度≤750 MPa

断面收缩率≥60%

硬度值214～225HV

实现免退火直接进行大减面率拉拔。

Abstract

By controlling billet temperature 780 ℃ as entering sizing mill

sizing reducing rate 42% (φ18.4 mm→ φ14 mm)

cooling rate 0.42 ℃/s

the microstructure of 35CrMo steel hot-rolled rod is F+P

with ferrite content more than 40%

actual grain size 10- 11

tensile strength 750 MPa

reduction of area≥60%

and hardness value 214-225HV

to realize annealing-free large reduction of cross-sectional area cold drawing.

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