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B-grade anti-acid pipeline steel plate and production process

A production process and steel plate technology, applied in the field of B-grade acid-resistant pipeline steel plate and production process, can solve the problems of high cost and large micro-alloying effect, and achieve refined structure and grain size, fine and uniform structure, and reduced production cost. Effect

Active Publication Date: 2019-05-28
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For Class B acid-resistant export pipelines, Nb has been used for tax rebates. Nb has a greater effect on product microalloying, can refine the grain size of the structure, and has no side effects on acid resistance, but the cost is high

Method used

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  • B-grade anti-acid pipeline steel plate and production process
  • B-grade anti-acid pipeline steel plate and production process
  • B-grade anti-acid pipeline steel plate and production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A grade B acid-resistant pipeline steel plate provided in this example has the following chemical composition and mass percentage: C: 0.010%-0.017%, Si: 0.10%-0.20%, Mn: 0.80%-0.89%, P≤0.012% , S≤0.0008%, Ni: 0.10%~0.18%, Cu: 0.10%~0.15%, Nb: 0.030%~0.040%, Mo: 0.10%~0.15%, Ti: 0.010%~0.016%, Ca: 0.001% ~0.002%, Al: 0.010%~0.036%, the balance is Fe and unavoidable impurities, Ceq: 0.16~0.23%, Pcm: 0.07~0.13%.

[0042] The production process of above-mentioned steel plate is as follows:

[0043] S1. Using top-bottom double-blowing converter smelting, LF+RH refining treatment to obtain vacuum-treated molten steel whose composition meets the design requirements, and casting it through a slab casting machine to obtain a low-magnification structure with a low-magnification Mannesmann standard rating of 2 or better;

[0044] S2. The slab heating temperature is 1103°C, the heating time is 10.1min / cm based on the thickness of the slab, and the soaking time is more than 40min; ...

Embodiment 2

[0049] A grade B acid-resistant pipeline steel plate provided in this example differs from Example 1 in that its chemical composition and mass percentage are as follows: C: 0.020%-0.030%, Si: 0.20%-0.30%, Mn: 0.80% ~0.90%, P≤0.015%, S≤0.0010%, Ni: 0.15%~0.20%, Cu: 0.15%~0.20%, Nb: 0.025%~0.035%, Mo: 0.08%~0.13%, Ti: 0.010% ~0.020%, Ca: 0.001%~0.003%, Al: 0.020%~0.040%, the balance is Fe and unavoidable impurities, Ceq: 0.16~0.23%, Pcm: 0.07~0.13%.

Embodiment 3

[0051] A grade B acid-resistant pipeline steel plate provided in this example has the following chemical composition and mass percentage: C: 0.030%-0.040%, Si: 0.15%-0.25%, Mn: 0.80%-0.90%, P≤0.015% , S≤0.0010%, Ni: 0.10%~0.15%, Cu: 0.10%~0.15%, Nb: 0.020%~0.030%, Mo: 0.10%~0.15%, Ti: 0.010%~0.020%, Ca: 0.001% ~0.003%, Al: 0.010%~0.030%, the balance is Fe and unavoidable impurities, Ceq: 0.16~0.23%, Pcm: 0.07~0.13%.

[0052] The production process of above-mentioned steel plate is as follows:

[0053] S1. Using top-bottom double-blowing converter smelting, LF+RH refining treatment to obtain vacuum-treated molten steel whose composition meets the design requirements, and casting it through a slab casting machine to obtain a low-magnification structure with a low-magnification Mannesmann standard rating of 2 or better; S2. The heating temperature of the slab is 1108°C, the heating time is calculated as 10.6min / cm based on the thickness of the slab, and the soaking time is more ...

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Abstract

The invention discloses a B-grade anti-acid pipeline steel plate. The chemical composition of the B-grade anti-acid pipeline steel plate comprise the following in mass percentage: 0.010-0.040% of C, 0.10-0.30% of Si, 0.80-0.90% of Mn, no more than 0.015% of P, no more than 0.0010% of S, 0.10-0.20% of Ni, 0.10-0.20% of Cu, 0.020-0.040% of Nb, 0.08-0.15% of Mo, 0.010-0.020% of Ti, 0.001-0.003% of Ca, 0.010-0.040% of Al, the balance Fe, inevitable impurities, 0.16-0.23% of Ceq, and 0.07-0.13% of Pcm. The invention uses a small amount of Nb alloy element, the tax refund treatment is conducted on the Mo element, the production cost is effectively reduced, and the product anti-acid corrosion resistance requirements are met.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a B-grade acid-resistant pipeline steel plate and a production process. Background technique [0002] Due to the over-saturation of the steel market, the competitiveness of enterprises is becoming increasingly fierce, and the gross profit of conventional varieties is getting lower and lower. The development of high-grade products has become the key to the survival and development of enterprises. The demand for pipeline steel products in the international market is quite large. Due to the difficulty in production of pipelines and the strict requirements on product quality, few companies have the qualifications to supply them. For Class B acid-resistant export pipelines, Nb has been used for tax rebates. Nb has a greater effect on product microalloying, can refine the grain size of the structure, and has no side effects on acid resistance, but the cost is high. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D8/02C21C7/10
Inventor 翟冬雨吴俊平方磊姜金星杜海军员强鹏殷杰吴强赵显鹏王凡王光磊黄灿
Owner NANJING IRON & STEEL CO LTD
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