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A kind of smelting method of chromium molybdenum steel for hydrogen equipment

A smelting method and a technology for hydrogenation equipment, which are applied in the smelting field of chromium-molybdenum steel for hydrogenation equipment, can solve the problems of harsh use conditions and the tendency of high-temperature tempering and embrittlement of chromium-molybdenum steel to increase, and reduce nitrogen content and hydrogen The effect of content

Active Publication Date: 2020-11-13
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Steel for hydrogen-facing equipment is used under harsh conditions and has been used in high-temperature, high-pressure, and hydrogen-facing environments for a long time. Due to its good high-temperature and durable strength, chromium-molybdenum steel has become the main material for steel for hydrogen-facing equipment, such as 15CrMoR, 12Cr2Mo1R, etc. However, with the increase of chromium and molybdenum content, the tendency of high temperature tempering embrittlement of chromium molybdenum steel increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is a method for smelting 12Cr2Mo1R hydrogen-prone chromium-molybdenum steel, and the production steps include:

[0024] (1) Hot metal pretreatment: The composition of hot metal is C=4.66%, Si=0.35%, Mn=0.34%, S=0.043%, P=0.136%, Sn=0.004%, As=0.0071% by weight percentage; using KR Stirring desulfurization, adding 0.46kg / t magnesium powder, removing the blast furnace slag before desulfurization, removing the desulfurization slag after desulfurization, the thickness of the slag layer after removing the slag meets the requirements of ≤25mm, and then measuring the temperature and sampling, the sulfur content in the hot metal is 0.0032 %, the temperature of molten iron is 1313°C;

[0025] (2) Converter: Dephosphorization by double slag method, adding 12.4t of high-quality steel scrap, 5.2t of lime, 1t of light-burned dolomite, 1.8t of fluorite, and 1.6t of iron ore for slagging, of which the amount of molten iron loaded It is 130.5t; the main blowing oxygen ...

Embodiment 2

[0031] This embodiment is a method for smelting 15CrMoR hydrogen-prone chromium-molybdenum steel, and the production steps include:

[0032] (1) (1) Hot metal pretreatment: The composition of hot metal by weight percentage is C=4.52%, Si=0.46%, Mn=0.40%, S=0.048%, P=0.147%, Sn=0.003%, As=0.0067% ; Use KR stirring method for desulfurization, add 0.25kg / t magnesium powder and 3.6kg / t lime, remove the blast furnace slag before desulfurization, remove the desulfurization slag after desulfurization, the thickness of the slag layer after removal meets the requirements of ≤25mm, and then measure Warm sampling, the sulfur content of molten iron is 0.0020%, and the temperature of molten iron is 1278°C;

[0033] (2) Converter: Dephosphorization by double slag method, adding 14.6t of high-quality steel scrap, 4.6t of lime, 1.5t of light-burned dolomite, 1.5t of fluorite, and 1.8t of iron ore for slagging, among which molten iron is put into The volume is 132.7t; the main blowing oxygen ...

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Abstract

The invention discloses a smelting method for chromium-molybdenum steel used for hydroforming equipment. The smelting method comprises the following main production steps: liquid iron pretreatment, converting, VD vacuum treatment, LF refining, RH vacuum treatment, and then pouring into blanks or ingots. The smelting process for liquid iron with low phosphorous, low tin and low arsenic is providedby using existing smelting production equipment, the content of phosphorous in the liquid iron is smaller than or equal to 0.006%, the content of tin in the liquid iron is smaller than or equal to 0.003%, and the content of arsenic inside the liquid iron is smaller than or equal to 0.006%. The liquid iron smelted by using the method is applicable for the production of hydroforming chromium-molybdenum steel such as 15CrMoR and 12Cr2Mo1R, so that the liquid iron has good high-temperature tempering embrittlement resistance.

Description

technical field [0001] The invention belongs to the technical field of molten steel smelting production, and in particular relates to a method for smelting chromium-molybdenum steel for hydrogen-facing equipment. The molten steel with low phosphorus, low tin and low arsenic is smelted, so that the produced chromium-molybdenum steel has good high temperature resistance Fire embrittlement ability. Background technique [0002] The steel for hydrogen-facing equipment is used under harsh conditions and has been used in high-temperature, high-pressure, and hydrogen-facing environments for a long time. Because of its good high-temperature and durable strength, chromium-molybdenum steel has become the main material for steel for hydrogen-facing equipment, such as 15CrMoR, 12Cr2Mo1R, etc. However, with the increase of chromium and molybdenum content, the tendency of high temperature tempering embrittlement of chromium molybdenum steel increases. According to the ASTM A387 standard,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/10C21C5/36C21C7/06C21C7/00C21C7/064C21C7/04
CPCC21C5/36C21C7/0056C21C7/0087C21C7/06C21C7/0645C21C7/10C22C33/06Y02P10/20
Inventor 彭宁琦罗登蒋凌枫刘丹史志凌
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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