Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel

周家林; 黄高; 向上; 潘成刚; 赖春明; 胡唐国

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Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel

更新时间：2026-01-21

- Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel
- Special Steel Vol. 35, Issue 3, Pages: 49-52(2014)
- 作者机构：
  
  1. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉,430081
  2. 武汉钢铁股份有限公司,武汉,430083
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 December 2013，
  
  Online First：30 August 2022，
  
  Published：30 August 2014
- 稿件说明：
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周家林, 黄高, 向上, et al. Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel[J]. Special Steel, 2014, 35(3): 49-52.
DOI：

周家林, 黄高, 向上, et al. Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel[J]. Special Steel, 2014, 35(3): 49-52. DOI：

摘要

研究了铁水脱硫处理-150 t转炉-RH-保护浇铸-控轧控冷工艺生产的Ti微合金化Q345D钢(/%:0.15C

0.27Si

1.36Mn

0.019Ti

0.011P

0.003S

0.026Als)30 mm×2500 mm中板的力学性能、组织和析出物。结果表明

Ti微合金化Q345D钢的抗拉强度≥525 MPa

屈服强度≥390 MPa

延伸率≥29%

-40℃冲击功125 J;该钢组织为珠光体+铁素体+少量索氏体

晶粒度为12~14级;钢中夹杂物主要为MnS和Ti

钢中析出物为50~250 nm弥散分布的TiN;钢的强度增加主要是TiN细晶强化作用引起的。

Abstract

The mechanical properties

structure and precipitates of medium plate 30 mm X 2 500 mm of Ti micro alloyed Q345D steel (/%: 0. 15C

0.27Si

1. 36Mn

0. 019Ti

0. 011P

0. 003S

0. 026Als) produced by hot metal desulphurizing-150 t converter-RH-shielding casting-control rolling and cooling process have been studied. Results show that of Ti microalloying Q345D steel the tensile strength is m525 MPa

yield strength N390 MPa

elongation >29% and the -40 ℃. impact energy is 125 J; the structure of steel consists of pearlite

ferrite and minor sorbite with grain size grade 12~14； the main inclusions in steel are MnS and Ti

the precipitates in steel are dispersive-distributed 50 ~250 nm TiN; and the increment of strength of steel is mainly caused by fine-grain strengthening of TiN.

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