6-8mm TMCP on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and production method thereof

A technology of low yield ratio and wear-resistant steel, applied in the field of wear-resistant steel, can solve the problems of high alloy cost and high content of Ti element, and achieve the effect of short manufacturing process, low yield ratio, and environmentally friendly process

Active Publication Date: 2020-07-24
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, precious Mo element is added, the content of Ti element is very high, and the alloy cost is high

Method used

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  • 6-8mm TMCP on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and production method thereof
  • 6-8mm TMCP on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and production method thereof
  • 6-8mm TMCP on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]As shown in Table 1 below, the chemical composition of the coils is shown. The slab heating temperature is 1200°C and the heating time is 130min. The rough rolling adopts R1 and R2 for 3+5 passes, and the thickness of the middle billet is 42mm; The method is two-stage cooling, the front stage is encrypted and rapidly cooled to 610°C, the air cooling time is 8s, and the coiling temperature is 100°C, and the coiled plate can be obtained. Such as figure 1 As shown, the metallographic structure of the coil is shown, which is a two-phase structure of ferrite + martensite, the grain structure is evenly distributed, and there is no mixed crystal and segregation.

Embodiment 2

[0037] As shown in Table 1 below, the chemical composition of the coils is shown. The slab heating temperature is 1210°C and the heating time is 125min. Rough rolling is carried out by R1 and R2 for 3+5 passes. The thickness of the intermediate billet is 44mm; The method is two-stage cooling, the front stage is encrypted and rapidly cooled to 625°C, the air cooling time is 9s, and the coiling temperature is 130°C to obtain the coiled plate. Such as figure 1 As shown, the metallographic structure of the coil is shown, which is a two-phase structure of ferrite + martensite, the grain structure is evenly distributed, and there is no mixed crystal and segregation.

Embodiment 3

[0039] As shown in Table 1 below, the chemical composition of the coils is shown. The slab heating temperature is 1220°C, and the heating time is 135 minutes. The rough rolling adopts R1 and R2 for 3+5 passes, and the thickness of the middle billet is 46mm; The method is two-stage cooling, the front stage is encrypted and rapidly cooled to 620°C, the air cooling time is 10s, and the coiling temperature is 155°C, so that the coil can be obtained. Such as figure 1 As shown, the metallographic structure of the coil is shown, which is a two-phase structure of ferrite + martensite, the grain structure is evenly distributed, and there is no mixed crystal and segregation.

[0040] Table 1: Embodiment 1~3 chemical composition (wt%)

[0041] Example C Si mn P S als Cr Nb Ti B Ca H O N 1 0.20 0.38 1.40 0.010 0.002 0.030 0.35 0.022 0.015 0.0012 0.0020 0.00010 0.0016 0.0032 2 0.19 0.42 1.35 0.008 0.002 0.035 0.33 0.020 0.018 ...

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Abstract

The invention discloses a 6-8mm TMCP on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate and a production method of the 6-8mm TMCP on-line quenching low-yield-ratiohigh-strength wear-resistant steel NM400 coiled plate. According to the chemical components of the coiled plate, the coiled plate comprises, by mass percentage, 0.18%-0.22% of C, 0.30%-0.50% Si, 1.30%-1.45% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.003% of S, 0.015%-0.025% of Nb, 0.010%-0.025% of Ti, 0.25%-0.40% of Cr, 0.0005%-0.0020% of B, 0.0010%-0.0030% of Ca, 0.020%-0.050% of Al, smaller than or equal to 2ppm of H, smaller than or equal to 30ppm of O, smaller than or equal to 50ppm of N and the balance Fe and inevitable impurities. The provided coiled plate has excellent mechanical properties, a metallographic structure is a ferrite and martensite two-phase structure, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant steel, and specifically relates to a 6-8mm TMCP online quenching low-yield ratio high-strength wear-resistant steel NM400 coil and a production method thereof. Background technique [0002] With the development trend of lightweight, the steel used for dump truck tanks, tank trucks, transport vehicle boxes, and wear-resistant linings has turned to thin-gauge wear-resistant steel. High-strength steel can effectively reduce the thickness of materials while improving strength. , The weight of the car body can be reduced by more than 30%, thereby improving the power of the car, reducing fuel consumption, and reducing exhaust pollution. It has significant environmental protection, economic and social benefits, and the market demand has increased significantly. Wear-resistant steel is required to have high strength and hardness, good toughness, and also requires excellent welding performance and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/28C22C38/26C22C38/06C22C38/04C22C38/02C22C33/04C21C5/35C21C7/064C21C7/10B22D11/16C21D8/02
CPCB22D11/16C21C5/35C21C7/064C21C7/10C21D8/0205C21D8/0226C21D8/0247C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28C22C38/32
Inventor 王少炳宿成李钊袁晓鸣武利平卢晓禹黄利
Owner BAOTOU IRON & STEEL GRP
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