High-hardness large forged steel supporting roller and manufacturing method thereof

A manufacturing method and technology for supporting rolls, which are applied in the directions of manufacturing tools, furnace types, metal rolling, etc., and can solve the problems of low surface hardness of the roll body.

Active Publication Date: 2021-03-02
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the surface hardness of the large forged steel back-up roll made of conventional Cr5 is low, and to provide a roll body with a surface hardness of more than 75HSD and a hardened layer depth of more than 70mm, which can meet the requirements of post-processing line rolling mills. Required high-hardness large-scale forged steel backup roll and manufacturing method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0018] The manufacturing method of the high-hardness large-scale forged steel backup roll of the present embodiment is as follows:

[0019] ① According to the following chemical composition and weight percentage, adopt conventional methods to smelt and forge the roll blank: carbon 0.51%, silicon 0.82%, manganese 0.90%, chromium 5.19%, nickel 0.14%, molybdenum 0.50%, vanadium 0.20%, phosphorus 0.008%, Sulfur ≤ 0.003%, the rest is iron and unavoidable impurities.

[0020] ②Preliminary heat treatment at a temperature of 980°C.

[0021] ③ Semi-finishing: Grinding the surface of the roller body to a roughness Ra of 0.5 μm, and processing the chamfering of the roller body to R80, and polishing the chamfer within 50-100 mm.

[0022] ④ final heat treatment, as follows:

[0023] S1: Before the overall induction heating, paste refractory cotton on the end face of the roll body and the joint of the roll neck of the roll body, and then preheat the large forged steel backup roll at a tem...

Embodiment 2～ Embodiment 5）

[0031] The manufacturing method of the high-hardness large-scale forged steel backup roll of each embodiment is basically the same as that of embodiment 1, and the difference is shown in Table 1.

[0032] Table 1

[0033] Example 1 Example 2 Example 3 Example 4 Example 5 C 0.51% 0.51% 0.51% 0.45% 0.55% Si 0.82% 0.82% 0.82% 1.00% 0.75% mn 0.90% 0.90% 0.90% 1.00% 0.80% Cr 5.19% 5.19% 5.19% 4.80% 5.50% Ni 0.14% 0.14% 0.14% 0.10% 0.30% Mo 0.50% 0.50% 0.50% 0.40% 0.70% V 0.20% 0.20% 0.20% 0.10% 0.30% P 0.008% 0.008% 0.008% 0.008% 0.008% S 0.003% 0.003% 0.003% 0.003% 0.003% The first stage 1800kW / 30min 2000kW / 25min 1700kW / 35min 1800kW / 30min 1800kW / 30min second stage 1000kW / 30min 1200kW / 25min 800kW / 35min 1000kW / 30min 1000kW / 30min The third stage 400kW / 40min 500kW / 30min 300kW / 50min 400kW / 40min 400kW / 40min

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Abstract

The invention discloses a high-hardness large forged steel supporting roller and a manufacturing method thereof. The manufacturing method comprises the steps of smelting and forging a roller blank according to chemical components in percentage by weight, preliminary heat treating, semi finish machining, final heat treating and finish machining, and overall induction quenching in the final heat treating adopts a three-stage power heating mode which comprises the steps that heat preservation is firstly performed for 25-35 min at the power of 1700-2000 kW, then the heat preservation is performedfor 25-35 min at the power of 800-1200 kW, and finally, the heat preservation is performed for 30-50 min at the power of 300-500 kW. By means of the high-hardness large forged steel supporting rollerand the manufacturing method thereof, on the one hand, the content of part of alloy elements in a large forged steel supporting roller made of a conventional Cr5 material is optimized, on the other hand, special overall induction quenching is adopted for quenching the surface of a roller body of the supporting roller, and finally, the high-hardness large forged steel supporting roller with the roller body surface hardness being 75 HSD or above, the hardening layer depth being 70 mm or above and the hardness descending gradient being small can be manufactured, so that the requirements of a post-processing line rolling mill can be met.

Description

technical field [0001] The invention belongs to the technical field of large-scale forged steel support rolls, and in particular relates to a high-hardness large-scale forged steel support roll and a manufacturing method thereof. Background technique [0002] Large forged steel backup rolls are the core functional components of modern steel rolling equipment, mainly bearing the rolling load of work rolls or intermediate rolls. [0003] With the continuous development of large-scale, high-speed and high-precision cold / hot rolling mills in China, the hardness of cold / hot-rolled work rolls continues to increase. requirements, and with the increasing demand for products such as high-tech content and high value-added strips, the post-processing line rolling mills of steel mills have an increasing demand for high-hardness large-scale forged steel backup rolls. [0004] The technical requirements for high-hardness large-scale forged steel backup rolls are: the surface hardness of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C33/04C21D6/00C21D1/18C21D1/10C21D9/38B21B29/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C33/04C21D6/004C21D6/005C21D6/008C21D1/18C21D1/10C21D9/38B21B29/00C21D2261/00Y02P10/25
Inventor 陈伟王瑞胡现龙兰勇王文明孙文忠
Owner BAOSTEEL ROLL SCI & TECH
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