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High tempering parameter SR embrittlement resistant cryogenic nickel steel and manufacture method thereof

A manufacturing method and parameter technology, which is applied in low-temperature nickel steel and its manufacture, manufacturing materials for marine low-temperature storage tanks, LPG low-temperature storage tanks, low-temperature nickel steel fields, and can solve high manufacturing costs, large fluctuations, long steel plate manufacturing cycles, etc. question

Active Publication Date: 2013-12-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the two times of normalizing heat treatment, the manufacturing cycle of the steel plate is long and the manufacturing cost is high. More importantly, when the thickness of the steel plate exceeds 60mm, the impact toughness at -101°C of the steel plate after high tempering parameter SR is unstable and fluctuates greatly. , and the strength declines greatly, and the quality control of the steel plate is poor ("Study on the brittleness of steel の烧どし brittleness niguan する", 1976, P123~P144, Japan Iron and Steel Association; ibid, P95~P105, Japan Iron and Steel Association; "Iron and Steel", S281, 1977; "Iron and Steel", S326, 1978)
[0006] In addition, when welding with large input energy, the low-temperature toughness of the welding heat-affected zone (HAZ) is seriously deteriorated, and the low-temperature ductile-brittle transition temperature of the heat-affected zone (HAZ) is generally difficult to reach -80°C, let alone reach ultra-low temperature- 101°C (such as European Patent EP 0288054A2, EP0839921A1, US Patent 4851052)

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  • High tempering parameter SR embrittlement resistant cryogenic nickel steel and manufacture method thereof
  • High tempering parameter SR embrittlement resistant cryogenic nickel steel and manufacture method thereof
  • High tempering parameter SR embrittlement resistant cryogenic nickel steel and manufacture method thereof

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Embodiment Construction

[0082] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0083] The manufacturing process of the embodiment is: TDS molten iron deep desulfurization → converter smelting → LF → RH (feeding Si-Ca wire) → continuous casting (using light reduction process) → slab off-line finishing → slab cut to length → Heating → controlled rolling (TMR) → weakly accelerated cooling (air cooling) → slow cooling of steel plate stack / pit slow cooling → AUT / MUT → trimming of steel plate, cutting head and tail → rough shot blasting to remove scale on the surface of steel plate → normalizing +Tempering heat treatment (N+T)→sampling and performance testing→cutting steel plates to length→surface quality and appearance dimensions, marking and testing→delivery.

[0084] The ingredient composition of the embodiment of the present invention shown in Table 1. Table 2 and Table 3 are the manufacturing process of the embodiment of the prese...

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Abstract

A high tempering parameter SR embrittlement resistant cryogenic nickel steel and a manufacture method thereof. The nickel steel comprises, by weight, 0.025%-0.060% of C, Si no more than 0.15%, 0.45%-0.85% of Mn, P no more than 0.012%, S no more than 0.0020%, 0.10%-0.40% of Cu, 2.80%-3.80% of Ni, 0.10%-0.30% of Cr, 0.05%-0.30% of Mo, 0.040%-0.070% of Als, 0.006%-0.012% of Ti, 0.008%-0.025% of Nb, N no more than 0.0040%, 0.001%-0.003% of Ca, residual iron and unavoidable inclusions. According to optimized controlled rolling and a normalizing plus tempering technology, the nickel steel gains extremely high ultralow temperature toughness, excellent HIC / SCC resistance, weldability and bearing capacity of high heat input welding; besides, the nickel steel has excellent high tempering parameter SR embrittlement resistance characteristic, and is especially suitable for manufacture of large-scale LPG low temperature storage tank, low temperature storage tank for ship and large-scale steel structure for ice ocean and polar region.

Description

technical field [0001] The present invention relates to low-temperature steel and its manufacturing method, in particular to low-temperature nickel steel resistant to high tempering parameter SR embrittlement and its manufacturing method. Low-temperature nickel steel that is welded and resistant to HIC and SCC is mainly used for the manufacture of LPG low-temperature storage tanks and marine low-temperature storage tanks. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridge structures, boiler containers, building structures, automobile industry, railway transportation and machinery manufacturing among. The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50B21B37/74C21D1/28C21D1/18
Inventor 刘自成徐国栋施青李先聚
Owner BAOSHAN IRON & STEEL CO LTD
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