Effect of Nb Microalloying on the Microstructure and Properties of X32 Steel Strip for Backing Material of Bimetallic Band Saw Blade

Qin Jie; Zhang Zhibo; Xu Mei; Li Cong

doi:10.20057/j.1003-8620.N260084

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Effect of Nb Microalloying on the Microstructure and Properties of X32 Steel Strip for Backing Material of Bimetallic Band Saw Blade

Product Research and Development | 更新时间：2026-10-22

- Effect of Nb Microalloying on the Microstructure and Properties of X32 Steel Strip for Backing Material of Bimetallic Band Saw Blade
- Special Steel Pages: 1-6(2026)
- 作者机构：
  
  山西太钢不锈钢股份有限公司技术中心，太原030003
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N260084
  CLC： TF142.3
- Received：10 June 2026，
  
  Revised：2026-08-06，
  
  Accepted：12 August 2026，
  
  Online First：14 September 2026，
- 稿件说明：
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秦洁,张志波,徐梅等.Nb微合金化对双金属带锯条背材X32钢带产品的组织性能影响[J].特殊钢,

Qin Jie,Zhang Zhibo,Xu Mei,et al.Effect of Nb Microalloying on the Microstructure and Properties of X32 Steel Strip for Backing Material of Bimetallic Band Saw Blade[J].Special Steel,
秦洁,张志波,徐梅等.Nb微合金化对双金属带锯条背材X32钢带产品的组织性能影响[J].特殊钢, DOI：.

Qin Jie,Zhang Zhibo,Xu Mei,et al.Effect of Nb Microalloying on the Microstructure and Properties of X32 Steel Strip for Backing Material of Bimetallic Band Saw Blade[J].Special Steel, DOI：.

摘要

在中碳Cr-Mo-Ni-V高合金成分体系基础上添加0.05%

［Nb］、经热轧后750 ℃退火、用户多轧程冷轧及1 050 ℃淬火+500 ℃回火等加工热处理工序生产的一种Nb微合金化双金属带锯条背材X32钢带产品。对Nb微合金化双金属带锯条背材X32试验钢在不同工序状态下的力学性能进行了分析，并通过金相显微镜（OM）和透射电子显微镜（TEM）等方法对试验钢微观组织及碳化物析出相进行了表征分析。结果表明，X32钢带退火态组织主要为粒状珠光体，细小铁素体组织基体上弥散分布着M

碳化物（尺寸约30~100 nm）；成品组织主要为回火屈氏体，板条内存在少量未溶的（Nb，M）C碳化物及以Cr、Fe为主的细针状合金偏聚区。采用Nb微合金化的双金属带锯条背材试验钢（X32-Nb）在热轧退火、冷轧半成品及其成品工序中，较X32钢的硬度、强度均略有升高，伸长率未明显降低，锯条成品空转试验寿命更长。X32-Nb试验钢成品硬度50.5HRC、强度1 548 MPa、伸长率14.5%，锯条空转试验寿命70.5 h，满足用户使用要求。

Abstract

The Nb micro-alloyed X32 steel strip， used as the backing material for bimetallic band saw blades， is based on a medium-carbon Cr-Mo-Ni-V high-alloy composition system with the addition of 0.05%

［Nb］. The manufacturing route involves hot rolling and annealing at 750 ℃ carried out by TISCO， followed by multi-pass cold rolling， quenching at 1 050 ℃， and tempering at 500 ℃ performed by the users. The mechanical properties of the Nb micro-alloyed X32 steel used as backing material for bimetallic band saw are analyzed under different processing states， and the microstructure and carbide precipitates of the experimental steel are characterized by optical microscopy （OM） and transmission electron microscopy （TEM）. The results show that the microstructure of X32 steel strip in the annealed state is mainly granular pearlite， with a large number of M

spherical carbides approximately 30 nm-100 nm dispersed in the fine ferrite matrix； the microstructure of the finished product is mainly tempered troostite， with a small amount of undissolved （Nb，M）C carbides and fine needle-like alloy segregation zones （primarily composed of Cr and Fe） distributed within the laths. The Nb micro-alloyed X32-Nb experimental steel used as backing material for bimetall

ic band saw exhibits higher hardness and strength at the hot-rolled and annealed， cold-rolled semi-finished， and finished processes compared to X32 steel， without obvious deterioration in elongation. Moreover， the finished saw blade demonstrates a longer service life in the idling test..The finished X32-Nb experimental steel saw blade exhibited a hardness of 50.5HRC， a tensile strength of 1 548 MPa， an elongation of 14.5%， and an idling-test service life of 70.5 h， thereby meeting the application requirements of users.

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