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Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof

A wide and thick plate, quenching and tempering technology, applied in the field of quenched and tempered anti-HIC, SSC wide and thick plate and its preparation, can solve problems such as deterioration and change, and achieve the effect of improved corrosion resistance, uniform structure and good mechanical properties

Active Publication Date: 2015-09-30
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a quenched and tempered anti-HIC, SSC wide and thick plate and its preparation method, which solves the problems of quenched and tempered pipeline steel structure change, deterioration of HIC, SSC and low temperature toughness, and is especially suitable for transporting highly corrosive oil and gas pipes, fittings, etc.

Method used

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  • Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof
  • Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof
  • Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition (wt%) is shown in Table 1, and N: ≤0.006%, H: ≤0.00015%, Ca: ≤0.004%, Ca / s: ≥2.0. The thickness of the continuous casting slab is 300mm, the thickness of the steel plate is 12.5mm, the continuous casting light reduction rate is 3%, the pouring temperature of the tundish is 1550°C, and the casting speed of the slab is 0.85m / min. The slab heating temperature is 1190°C. The starting temperature of ordinary rolling is 1150°C, and the single-pass reduction rate is 12-23%; the rolling temperature in the non-recrystallized area is 50mm thick, the starting temperature after controlled rolling is 910°C, and the final rolling temperature is 825°C. The steel plate is immersed in water to accelerate cooling, the final cooling temperature is 650°C, and the cooling rate is 15°C / s. The quenching temperature of the steel plate is 950°C, the holding time is 20min, and the water cooling rate is 38°C / s; the tempering temperature is 550°C, the holding time is 35mi...

Embodiment 2

[0038]The chemical composition (wt%) is shown in Table 1, and N: ≤0.006%, H: ≤0.00015%, Ca: ≤0.004%, Ca / s: ≥2.0. The thickness of the continuous casting slab is 300mm, the thickness of the steel plate is 14.3mm, the continuous casting light reduction rate is 4%, the pouring temperature of the tundish is 1540°C, and the casting speed of the slab is 0.80m / min. The slab heating temperature is 1180°C. The starting temperature of ordinary rolling is 1120°C, and the single-pass reduction rate is 13-25%; the temperature-controlled thickness of rolling in the non-recrystallized area is 57mm, the starting rolling temperature after controlled rolling is 900°C, and the final rolling temperature is 815°C. The steel plate is immersed in water to accelerate cooling, the final cooling temperature is 620°C, and the cooling rate is 13°C / s. The quenching temperature of the steel plate is 930°C, the holding time is 25min, and the water cooling rate is 35°C / s; the tempering temperature is 530°C,...

Embodiment 3

[0040] The chemical composition (wt%) is shown in Table 1, and N: ≤0.006%, H: ≤0.00015%, Ca: ≤0.004%, Ca / s: ≥2.0. The thickness of the continuous casting slab is 300mm, the thickness of the steel plate is 17.5mm, the continuous casting light reduction rate is 4.5%, the pouring temperature of the tundish is 1535°C, and the casting speed of the slab is 0.75m / min. The slab heating temperature is 1170°C. The starting temperature of ordinary rolling is 1115°C, and the reduction rate of a single pass is 15-28%; the rolling temperature control thickness in the non-recrystallized area is 65mm, the starting rolling temperature after controlled rolling is 885°C, and the final rolling temperature is 805°C. The steel plate is immersed in water to accelerate cooling, the final cooling temperature is 580°C, and the cooling rate is 12°C / s. The quenching temperature of the steel plate is 920°C, the holding time is 32min, and the water cooling rate is 32°C / s; the tempering temperature is 500°...

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Abstract

The invention provides a quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and a preparation method thereof, which belong to the technical field of low-carbon microalloyed steel production. The preparation method mainly comprises the processes of smelting and casting of a plate blank, heating of the plate blank, rolling and heat treatment of a steel plate, and the like. The preparation method has the advantages that the steel plate has good mechanical performance and excellent HIC-resistant and SSC-resistant performance through a reasonable composition system, ultraclean steel smelting, optimum rolling process and advanced heat treatment technology; and Mo-free and low-Ni alloy production is adopted, so that consumption of precious alloy is reduced, and the production cost is relatively low.

Description

technical field [0001] The invention belongs to the technical field of low-carbon micro-alloy steel production, in particular to a quenched and tempered anti-HIC, SSC wide thick plate and a preparation method thereof. Background technique [0002] As we all know, pipeline transportation is the most economical and reasonable transportation method for oil and natural gas. In recent years, with the successive development of oil and gas fields in severe corrosive environments at home and abroad, the requirements for the use of oil and gas pipelines have become more stringent. Corrosion is a major problem that has plagued oil and gas production for a long time, and sulfide corrosion is the most serious corrosion problem in pipelines. Due to the frequent occurrence of sulfides contained in oil and natural gas causing corrosion or even more serious damage to pipelines, sulfide corrosion has increasingly become a major obstacle to crude oil production at home and abroad, not only b...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D8/02
Inventor 谌铁强宋欣白学军张学峰闫智平周金明
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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