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Method for producing boron-containing non-quenching and tempering plastic mold steel

A technology of plastic mold steel and manufacturing method, applied in the direction of temperature control, metal rolling, etc., can solve the problems of high cost, long production cycle, and many production links, etc.

Active Publication Date: 2009-01-28
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing non-quenched and tempered plastic mold steel containing B, which solves the problems of many production links, long production cycle and high cost in the production of existing plastic mold steel

Method used

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  • Method for producing boron-containing non-quenching and tempering plastic mold steel
  • Method for producing boron-containing non-quenching and tempering plastic mold steel
  • Method for producing boron-containing non-quenching and tempering plastic mold steel

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Embodiment 1

[0020] The chemical composition of the steel plate is shown in Example 1 in Table 1. The size of the cast slab is 220 mm × 1700 mm, and the size of the finished plate is 20 × 2000 × L. Rolling is carried out according to the production process shown in Example 1 in Table 2. 3 shows the mechanical properties. The hardness distribution of the cross-section of the steel plate is shown in Figure 4, the hardness difference is ≤20HV, and the polishability of the steel plate is shown in Table 4. The properties of the steel plates are in line with the requirements of P20 pre-hardened steel plates.

Embodiment 2

[0022] The chemical composition of the steel plate is as shown in Example 2 in Table 1. The size of the cast slab is 250 mm × 1700 mm, and the size of the finished plate is 50 × 2000 × L. Rolling is carried out according to the production process shown in Example 2 in Table 2. 3 shows the mechanical properties. The hardness distribution of the cross-section of the steel plate is shown in Figure 4, and the difference in hardness is ≤20HV. The polishability of the steel plate is shown in Table 4. The properties of the steel plates are in line with the requirements of P20 pre-hardened steel plates.

[0023] Table 1 embodiment measured chemical composition (mass fraction %, balance is Fe)

[0024]

[0025] Table 2 embodiment technological parameter

[0026]

[0027] Table 3 embodiment mechanical property

[0028]

[0029] Table 4 embodiment steel plate surface roughness

[0030]

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Abstract

A production method of a boracic non-hardened and tempered plastic die steel belongs to the technical field of medium steel plate production. The process is that a continuous casting billet is soaked at the temperature of 1150-1250 DEG C; the hot rolling temperature is controlled, the start rolling temperature of the finish rolling is 900-950 DEG C, and the finishing rolling temperature is 840-880 DEG C; the steel plate is in controlled cooling after the hot rolling, and the cooling speed is controlled at 1-5 DEG C per second; and tempering treatment is required after rolling. The methods of controlled rolling and controlled cooling are adopted to obtain the 20-80mm bainite structure steel plate, stress relief tempering is carried out after rolling, and the combination property of the steel plate meets the process requirements of P20 pre-hardened steel. The yield strength of the steel plate is not less than 650MPa, the tensile strength is not less than 900MPa, the hardness of the cross section is 280-330HV, and the polishing property meets the requirements of P20 pre-hardened steel plates.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate steel manufacturing, and in particular provides a method for manufacturing boron-containing non-quenched and tempered plastic mold steel, so that the yield strength is ≥660MPa, the tensile strength is ≥960MPa, the hardness is HV280-320, and the metallographic The organization is bainite. Background technique [0002] For a long time, the production of plastic mold steel has almost always been produced by special steel plants in the modular form of ingot casting-billet opening-rolling-pre-hardening heat treatment, which has many production links, long production cycle and high cost. The invention aims at producing thick plates of plastic mold steel meeting the performance requirements by using the method of controlled rolling and controlled cooling on the medium and heavy plate rolling mill, so as to improve the production efficiency and expand the production scale. There are preced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B37/74C22C38/38C22C38/32C21D8/02
Inventor 金茹麻庆申张炜星高彩茹陈松林宋增强吕延春郑会平田士平闫治平王臻明
Owner SHOUGANG CORPORATION
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