Low-temperature toughness chromium-molybdenum steel plate and production method

A technology of low temperature toughness and production method, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of high alloy cost and high production cost, and achieve the effects of stable mechanical properties, low cost, and stable strength control.

Pending Publication Date: 2020-06-16
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the above-mentioned patented alloy is high, requiring special normalizing furnace equipment, and the production cost is high

Method used

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  • Low-temperature toughness chromium-molybdenum steel plate and production method
  • Low-temperature toughness chromium-molybdenum steel plate and production method
  • Low-temperature toughness chromium-molybdenum steel plate and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low-temperature toughness chromium-molybdenum steel sheet, including the following chemical components by mass percentage: see Table 1 below; the rest are Fe and unavoidable impurities.

[0038] The production method of the low-temperature toughness chromium-molybdenum steel plate includes the following processes:

[0039] 1) Steelmaking process: when the tapping water is 1 / 4 weight, add in the order of "ferromanganese-ferrosilicon-aluminum block", and the whole process Al is controlled at 0.020-0.040%; LF furnace adds silicon carbide, calcium carbide, Al particles and other deoxidizers Make white slag and electrify the slag for 6 minutes; RH vacuum process, vacuum degree 43Pa, vacuum time 16min, pure degassing time 10min, after RH vacuum degassing, feed calcium wire 110m, soft argon 8min after feeding wire;

[0040] 2) Billet heating process: 210mm thick billet preheating section temperature is 750-850℃, the first heating section is 1150-1200℃, the second heating section is...

Embodiment 2

[0044] A low-temperature toughness chromium-molybdenum steel sheet, including the following chemical components by mass percentage: see Table 1 below; the rest are Fe and unavoidable impurities.

[0045] The production method of the low-temperature toughness chromium-molybdenum steel plate includes the following processes:

[0046] 1) Steelmaking process: when the tapping water is 1 / 4 weight, add in the order of "ferromanganese-ferrosilicon-aluminum block", and the whole process Al is controlled at 0.020-0.040%; LF furnace adds ferrosilicon, Al particles and other deoxidizers to make white The slag is electrified for 6 minutes; RH vacuum process, vacuum degree 37Pa, vacuum time 17min, pure degassing time 11min, after RH vacuum degassing, feed calcium wire 120m, soft argon 7min after feeding wire;

[0047] 2) Billet heating process: 210mm thick billet preheating section temperature is 750-850℃, the first heating section is 1150-1200℃, the second heating section is 1230-1250℃, the soak...

Embodiment 3

[0051] A low-temperature toughness chromium-molybdenum steel sheet, including the following chemical components by mass percentage: see Table 1 below; the rest are Fe and unavoidable impurities.

[0052] The production method of the low-temperature toughness chromium-molybdenum steel plate includes the following processes:

[0053] 1) Steelmaking process: when the tapping water is 1 / 4 weight, add in the order of "ferromanganese-ferrosilicon-aluminum block", and the whole process Al is controlled at 0.020-0.040%; LF furnace adds ferrosilicon, Al particles and other deoxidizers to make white Slag, electrify the slag for 7 minutes; RH vacuum process, vacuum degree 27Pa, vacuum time 16min, pure degassing time 11min, after RH vacuum degassing, feed calcium wire 115m, soft argon after feeding 9min;

[0054] 2) Billet heating process: 250mm thick billet preheating section temperature is 750-850℃, the first heating section is 1150-1200℃, the second heating section is 1230-1250℃, the soaking ...

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Abstract

The invention provides a low-temperature toughness chromium-molybdenum steel plate and a production method. The low-temperature toughness chromium-molybdenum steel plate comprises the chemical components: 0.14%-0.17% of C, 0.40%-0.55% of Mn, 0.50%-0.60% of Si, not greater than 0.008% of S, not greater than 0.015% of P, 1.15%-1.35% of Cr, 0.45%-0.55% of Mo, 0.02%-0.04% of Alt and the balance Fe andinevitable impurities. According to the low-temperature toughness chromium-molybdenum steel plate, a noble metal is not added, and a special process does not need to be employed to reduce the contentof sulfur and phosphorus in steel, so that cost is low; a ferrite + pearlite + bainite structure is obtained by final rolling temperature control and cooling after rolling through a normalizing + tempering process; and the tensile strength Rm is 550-650 MPa, the yield strength Rel is 350-450 MPa, the elongation A (L0 = 200mm) is not less than 22%, and the lateral V-shaped impact average value at-29 DEG C is not less than 47J.

Description

Technical field [0001] The invention belongs to the technical field of alloy smelting, and specifically relates to a low-temperature toughness chromium-molybdenum steel plate and a production method. Background technique [0002] SA387Gr.11 Cl.2 steel is American standard container steel. Because this steel is added with Cr and Mo elements at the same time, it has good high temperature performance and thermal strength. This steel belongs to American standard ASME SA387 / SA387M middle class II steel, and is widely used It is used to manufacture large-scale equipment such as thermal power equipment, nuclear power equipment, and petroleum, chemical, coal conversion equipment in contact with hydrogen. Because it works under higher temperature and pressure, its service conditions are harsh, so the material is required to have higher thermal strength, good toughness and plasticity, corrosion resistance and welding performance. Containers made of this steel grade have been operating at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21D1/18C21D1/28C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/22
CPCC21D1/18C21D1/28C21D6/002C21D6/005C21D6/008C21D8/0226C21D9/0081C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 董富军
Owner 新余钢铁股份有限公司
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