A kind of steel plate for ni-mo low-temperature high-toughness X100 pipe fittings and its manufacturing method

A manufacturing method and high-toughness technology, applied in the field of steel plate manufacturing, can solve the problems of low steel plate strength, low steel qualification rate, and large drop in strength value, so as to improve production efficiency and yield, relax heat treatment process conditions and yield. and the effect of improving the pass rate

A manufacturing method and high-toughness technology, applied in the field of steel plate manufacturing, can solve the problems of low steel plate strength, low steel qualification rate, and large drop in strength value, so as to improve production efficiency and yield, relax heat treatment process conditions and yield. and the effect of improving the pass rate

CN104328357BActive Publication Date: 2016-03-16JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • A kind of steel plate for ni-mo low-temperature high-toughness X100 pipe fittings and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0032] The thickness of the steel plate for X100 pipe fittings involved in this example is 45mm, and its chemical composition is calculated by mass percentage: C: 0.12%, Mn: 1.5%, Si: 0.3%, S: 0.0015%, P: 0.01%, Nb: 0.04%, Ti: 0.018%, V: 0.08%, Alt: 0.03%, N: ≤0.010%, O: ≤0.006%, Mo: 0.40~0.50%, Cu: ≤0.35%, Ni: 0.51~0.65%, Cr: ≤0.35%, Ca: ≤0.01%, Ceq=0.52, Pcm=0.24 and the rest are Fe and unavoidable impurities.

[0033] The manufacturing process of the 45mm thick steel plate for X100 pipe fittings is as follows: the smelting raw materials are configured according to the chemical composition of the finished steel plate, and the KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing are sequentially carried out to obtain molten steel with high purity. Afterwards, the continuous casting slab with a thickness of 370mm is continuously cast by the continuous casting machine; the continuous casting slab is heated to 1180°C for two-stage rolling: the fi...

Embodiment 2

[0036] The thickness of the steel plate for X100 pipe fittings involved in this example is 55mm, and its chemical composition is calculated by mass percentage: C: 0.09%, Mn: 1.8%, Si: 0.25%, S: 0.0015%, P: 0.01%, Nb: 0.065%, Ti: 0.018%, V: 0.04%, Alt: 0.028%, N: ≤0.010%, O: ≤0.006%, Mo: 0.40~0.50%, Cu: ≤0.35%, Ni: 0.51~0.65%, Cr: ≤0.35%, Ca: ≤0.01%, Ceq=0.55, Pcm=0.27, the rest is Fe and unavoidable impurities.

[0037] The manufacturing process of the 55mm thick steel plate for X100 pipe fittings is as follows: the smelting raw materials are configured according to the chemical composition of the finished steel plate, and the KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing are sequentially carried out to obtain molten steel with high purity. Afterwards, the continuous casting slab with a thickness of 370mm is continuously cast by the continuous casting machine; the continuous casting slab is heated to 1175°C for two-stage rolling: the fir...

Embodiment 3

[0040] The thickness of the steel plate for X100 pipe fittings involved in this example is 38mm, and its chemical composition is calculated by mass percentage: C: 0.11%, Mn: 1.6%, Si: 0.2%, S: 0.0015%, P: 0.01%, Nb: 0.055%, Ti: 0.018%, V: 0.07%, Alt: 0.03%, N: ≤0.010%, O: ≤0.006%, Mo: 0.40~0.50%, Cu: ≤0.35%, Ni: 0.51~0.65%, Cr: ≤0.35%, Ca: ≤0.01%, where Ceq=0.50, Pcm=0.23, and the rest are Fe and unavoidable impurities.

[0041] The manufacturing process of the 38mm-thick X100 steel plate for pipe fittings is to configure smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and then sequentially perform KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing to obtain molten steel with high purity. Afterwards, the continuous casting slab with a thickness of 370mm is continuously cast by the continuous casting machine; the continuous casting slab is heated to 1183°C for two-stage rolling: the fir...

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Abstract

The invention discloses a Ni-Mo steel plate for low-temperature high-toughness X100 pipe fittings. The chemical composition of the steel plate is C: 0.09-0.12%, Mn: 1.5-1.9%, Si: 0.1-0.3%, and S: ≤0.003%, P: ≤0.015%, Nb: 0.04~0.065%, Ti: 0.008~0.03%, V: 0.02~0.10%, Alt: ≤0.06%, N:≤0.010%, O: ≤0.006%, Mo : 0.40~0.50%, Cu: ≤0.35%, Ni: 0.51~0.65%, Cr: ≤0.35%, Ca: ≤0.01%, and the rest is Fe. The manufacturing process includes molten steel smelting-external refining-slab reheating-TMCP process-quenching and tempering heat treatment. The finished product has high strength and high low-temperature toughness, which matches the welding of X100 main pipeline. The process window improves the yield and qualification rate of steel products.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a steel plate for X100 pipe fittings with ultra-high strength, low temperature and high toughness and a manufacturing method thereof. It has excellent welding matching performance with the main steel pipe. Background technique [0002] At present, the energy structure is still dominated by fossil energy structures such as oil and natural gas. Oil and natural gas mainly rely on pipeline transportation. Considering the safety and economy of pipeline construction and operation, in recent years, the strength and toughness of pipeline steel have been raised. more stringent requirements. Under the same delivery conditions (such as delivery pressure), the use of higher-grade pipeline steel can reduce the wall thickness of the pipeline, thereby reducing the amount of steel used and saving pipeline construction costs; or in the case of the same pipe diameter and wall ...

Claims

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Application Information

Patent Timeline
16 Mar 2016
Publication
CN104328357B
IPC
C22C38/58; C22C38/16; C22C38/14; C22C33/04; B21C37/02
CPC
C21D8/0205; C22C38/001; C22C38/002; C22C38/02; C22C38/04; C22C38/08; C22C38/12; C22C38/16
Inventors
蒋昌林; 李国忠