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Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof

A wear-resistant steel plate and high-toughness technology, applied in the field of special steel, can solve the problems of limited use, wear-resistant and long service life of manufactured parts, etc., and achieve the effect of improving the yield, simplifying the production process, and reducing the manufacturing cost.

Active Publication Date: 2017-03-22
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the "whole body hardening" of the steel plate alone cannot guarantee the robustness, wear resistance and long service life of the finished parts under complex working conditions. It also requires the steel plate to have high toughness in the entire thickness section to meet the requirements. Such a requirement, that is, the steel plate should have high impact toughness at 1 / 4 and 1 / 2 thickness
In contrast, the invention of CN105603323A only involves the surface hardness of the steel plate but does not involve the hardness on the entire thickness section, that is, it does not involve the "whole body hardening" performance; it only involves the impact toughness at 1 / 4 thickness of the steel plate and does not involve 1 / 4 2 Impact toughness at the thickness; only steel plates with a maximum thickness of 120mm can not be produced with greater thickness; these factors limit its use in high-toughness and large-thickness engineering and mining machinery wear-resistant parts that require "through-body hardening" (such as blades) board) for use in

Method used

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  • Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof
  • Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof
  • Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example relates to a through-body hardened high-toughness, easy-to-weld, wear-resistant steel plate with a thickness of 180 mm. The components and mass percentages included are: C: 0.12%, Si: 0.28%, Mn: 1.06%, P: 0.004%, S: 0.0006%, Cr: 0.70%, Mo: 0.50%, Ni: 2.49%, Cu: 0.26%, Al: 0.069%, V: 0.035%, Nb: 0.02%, N: 0.0032%, B: 0.0014%, Ca: 0.0017%, the balance is iron and unavoidable impurity elements, carbon equivalent CEV ( = C + Mn / 6 + (Cr + Mo + V) / 5 + (Cu +Ni) / 15 ) = 0.73%, after RH treatment H in molten steel = 0.00007%.

[0039] The production process of the whole body hardened high-toughness and easy-to-weld wear-resistant steel plate is as follows:

[0040] The smelting raw materials are configured according to the above chemical composition, followed by KR molten iron pretreatment – ​​converter smelting – LF refining – RH refining – continuous casting (thickness of continuous casting slab: 450mm) – continuous casting slab with cover and slow cooling – conti...

Embodiment 2

[0045] This embodiment relates to a through-hardened high-toughness weldable wear-resistant steel plate with a thickness of 125 mm, and the components, mass percentage and carbon equivalent CEV are the same as those in Embodiment 1. The manufacturing process of this embodiment is basically the same as that of Embodiment 1, the main difference being rolling and subsequent heat treatment, specifically as follows:

[0046] The continuous casting slab to be produced (thickness: 450mm, center segregation: class C 0.5, center porosity: 0.5, no center crack, corner crack and triangular crack, inclusions: A, B, C, D class = 0; Class A, B, D thin series = 0.5; Class C thin series = 0, Ds class = 0) Heating to 1260°C for 3.5 hours, after being out of the furnace, descaling with high-pressure water and then rolling in two stages. The starting temperature of the first stage rolling (i.e. rough rolling) is 1120°C, the thickness of the intermediate billet is 200mm, the total reduction rate ...

Embodiment 3

[0050] This example relates to a fully hardened, high-toughness, easy-to-weld, wear-resistant steel plate with a thickness of 115 mm. The components and mass percentages are: C: 0.14%, Si: 0.26%, Mn: 1.05%, P: 0.003%, S: 0.0012%, Cr: 0.66%, Mo: 0.51%, Ni: 1.39%, Cu: 0.26%, Al: 0.063%, V: 0.034%, Nb: 0.0032%, N: 0.0034%, B: 0.0018%, Ca: 0.0021%, the balance is iron and unavoidable impurity elements, carbon equivalent CEV ( = C + Mn / 6 + (Cr + Mo + V) / 5+ (Cu + Ni) / 15 ) = 0.67%, after H in molten steel after RH treatment = 0.00006%.

[0051] The smelting raw materials are configured according to the above chemical composition, followed by KR molten iron pretreatment – ​​converter smelting – LF refining – RH refining – continuous casting (thickness of continuous casting slab: 370mm) – continuous casting slab with cover and slow cooling – continuous casting slab cleaning – heating (insulation) treatment) – high pressure water descaling – controlled rolling – straightening – slow co...

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Abstract

The invention relates to a steel plate. Fe is taken as the base element of the steel plate; and the steel plate comprises, by mass, 0.11 to 0.15% if C, 0.20 to 0.40% of Si, 0.9 to 1.3% of Mn, P<=0.010%, S<=0.002%, 0.4 to 0.8% of Cr, 0.4 to 0.7% of Mo, 1.0 to 2.6% of Ni, 0.2 to 0.5% of Cu, 0.06 to 0.1% of Al, 0.03 to 0.06% of V, Nb<=0.04%, N<=0.006%, 0.001 to 0.002% of B, 0.0005 to 0.005 of Ca, Ca / S>=1, and Al>=(Mn / C)*(%N). A production method comprises following steps: KR molten iron pretreatment, converter steel making, LF refining, RH refining, continuous casting, covered slow cooling, control rolling, straightening, slow cooling, quenching, and tempering. The thickness of the obtained steel plate ranges from 110 to 180mm, carbon equivalent CEV is equal to or lower than 0.75%, Brinell hardness of the thickness cross section of the steel plate ranges from HBW320 to HBW400, and Charpy impact energy of the parts at 1 / 4 thickness and 1 / 2 thickness is larger than 60J at -40 DEG C.

Description

technical field [0001] The invention belongs to the technical field of special iron and steel, and in particular relates to a whole body hardened wear-resistant steel plate and a manufacturing method thereof. Background technique [0002] Engineering and mining machinery often use NM360 and NM400 steel plates with a surface Brinell hardness of about HBW360 and HBW400 to manufacture parts that require wear resistance. Chinese patent publication numbers CN104451409A, CN102747280B, CN103014543A, CN103233171A, CN105002430A, CN101775543A, CN101880831A, and CN103194674A disclose similar wear-resistant steel plates and manufacturing methods. However, the steel plates produced by these inventions have a small thickness (≤60mm), which cannot meet the requirements of some large-scale engineering and mining machinery for large-thickness (≥80mm) wear-resistant steel plates. The invention with the Chinese patent publication number CN105603323A discloses a wear-resistant steel plate with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/06C22C38/46C22C38/48C22C38/54C21D8/02B22D11/22
CPCB22D11/22C21D8/0226C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54
Inventor 苗丕峰刘观猷陈亮吴小林李经涛高助忠
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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