High-speed steel roller special for cold-rolled high-strength car plate and manufacturing method thereof

A manufacturing method and technology for automobile sheets, applied in the field of high-speed steel rolls, can solve the problems of easy cracking hardness, difficult to meet requirements, high energy consumption of salt bath furnace, achieve excellent hardness uniformity, avoid cracking failure, and increase accident resistance Effect

Active Publication Date: 2017-02-22
BAOSTEEL ROLL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this heat treatment process can ensure that the overall hardness of the produced high-speed steel roll is ≥64HRC and has high wear resistance, it still has the following disadvantages: (1) The salt bath furnace has high energy consumption and is harmful to the human body and the environment , belongs to the equipment to be eliminated; (2) The quenching heating temperature is high, resulting in a relatively coarse grain structure of the roll body, which affects the accident resistance of the roll; (3) Ordinary high-speed steel rolls are prone to cracking during the staged quenching process in salt bath furnaces Or the phenomenon that the hardness is difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0015] The chemical composition and weight percent of the special high-speed steel roll for cold rolling high-strength automobile plate of the present embodiment are as follows: carbon 0.86%; silicon 0.35%; manganese 0.28%; chromium 3.62%; molybdenum 4.34%; vanadium 1.61%; tungsten 5.38%; ≤0.030%; sulfur ≤0.030%; the rest is iron and unavoidable impurities.

[0016] The manufacturing method of the special high-speed steel roll for this cold-rolled high-strength automobile plate is as follows:

[0017] ① Smelt and forge the roll blank according to the chemical composition and weight percentage.

[0018] ②Preliminary heat treatment: heat preservation at 600°C for 4 hours, directly raise the temperature to 900°C for 9 hours, then cool down to 700°C at a rate of 40°C / h, hold heat for 12 hours, and then furnace cool to 500°C for release.

[0019] ③Semi-finishing, the processing requirements are: the roughness of the roll body is Ra≤3.2, all sharp corners are processed as rounded c...

Embodiment 2～ Embodiment 5）

[0025] The chemical composition, weight percentage and manufacturing method of the special high-speed steel rolls for cold-rolling high-strength automobile sheets of each embodiment are basically the same as those of Embodiment 1, and the differences are shown in Table 1.

[0026] Table 1

[0027] Example 1 Example 2 Example 3 Example 4 Example 5 C 0.86% 0.88% 0.80% 0.90% 0.85% Si 0.35% 0.38% 0.22% 0.43% 0.32% mn 0.28% 0.30% 0.15% 0.40% 0.28% Cr 3.62% 3.70% 3.58% 3.55% 3.65% Mo 4.34% 4.38% 4.40% 4.30% 4.25% V 1.61% 1.50% 1.67% 1.70% 1.55% W 5.38% 5.34% 5.30% 5.41% 5.45% P ≤0.030% ≤0.030% ≤0.030% ≤0.030% ≤0.030% S ≤0.030% ≤0.030% ≤0.030% ≤0.030% ≤0.030% first warm-up temperature 425℃ 410℃ 450℃ 400℃ 440℃ The second preheating temperature 825℃ 840℃ 810℃ 850℃ 800℃ Quenching heating temperature 1130℃ 1100℃ 1145℃ 1115℃ 1160℃ Oil outlet surface tempe...

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Abstract

The invention discloses a high-speed steel roller special for a cold-rolled high-strength car plate. The chemical components of the high-speed steel roller special for the cold-rolled high-strength car plate comprise, by weight, 0.80-0.90% of carbon, 0.20-0.45% of silicon, 0.15-0.40% of manganese, 3.55-3.70% of chromium, 4.25-4.40% of molybdenum, 1.50-1.70% of vanadium, 5.30-5.45% of tungsten, 0.030% or less of phosphorus, 0.030% or less of sulphur, and the balance iron and inevitable impurities. A manufacturing method of the high-speed steel roller special for the cold-rolled high-strength car plate comprises the following steps that a roller blank is smelted and forged according to the chemical components and weight percentage, and preheat treatment and ultimate heat treatment are conducted; and the ultimate heat treatment comprises the following methods that sub-temperature quenching plus oil cooling and twice tempering treatment are conducted by a protective atmosphere oven. The overall hardness of the high-speed steel roller special for the cold-rolled high-strength car plate is equal to or larger than 64HRC, the high-speed steel roller has high abrasion resistance and good accident resistance, and thus the demands of the rolling working conditions of high-strength steel and super high-strength steel can be met.

Description

technical field [0001] The invention belongs to the technical field of high-speed steel rolls, and in particular relates to a special high-speed steel roll for cold-rolling high-strength automobile plates and a manufacturing method thereof. Background technique [0002] High-strength steel usually refers to steel with a yield strength of more than 210MPa, and those with a yield strength of more than 550MPa are also called ultra-high-strength steel. High-strength steel and ultra-high-strength steel are modern automobile manufacturing materials that can not only ensure the lightweight of automobiles, but also improve the safety of automobiles. As the number of automobiles continues to grow, the demand for high-strength steel is also showing a significant upward trend. [0003] Compared with ordinary steel, high-strength steel has many types and high content of alloying elements, and has high deformation resistance during rolling. Therefore, it has higher requirements for the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D1/18C21D9/38B23P15/00
CPCB23P15/00C21D1/18C21D9/38C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 崔海峰胡现龙韩剑兰勇乔建平谢晶段洪波
Owner BAOSTEEL ROLL SCI & TECH
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