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B-stage acid-resistant pipeline steel plate and rolling process thereof

A technology for steel plates and pipelines, applied in the field of B-grade acid-resistant pipeline steel plates and rolling processes, can solve the problems of difficult production of acid-resistant pipelines, strict product quality requirements, and large micro-alloying effect, and achieves obstruction of acid gas erosion channels. , The effect of meeting the requirements of acid and corrosion resistance and refining the grain size of the structure

Active Publication Date: 2019-06-21
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 and the strict requirements on product quality, few companies have the qualifications to supply pipelines. For B-level acid-resistant export pipelines, Nb has always been used for tax rebates. Nb has a great effect on product microalloying and can refine the microstructure particle size, no side effects on anti-acid properties, but the cost is higher

Method used

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  • B-stage acid-resistant pipeline steel plate and rolling process thereof
  • B-stage acid-resistant pipeline steel plate and rolling process thereof
  • B-stage acid-resistant pipeline steel plate and rolling process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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: 0.03%~0.040%, Mo: 0.10%~0.15%, Ti: 0.01%~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%.

[0033] The rolling process of the grade B acid-resistant pipeline steel plate includes the following steps:

[0034] S1. After surface inspection, the blank is sent to a walking heating furnace for heating. The austenitizing temperature is 1100-1110°C. The heating time is 9.6-11min / cm calculated based on the thickness of the billet, and the soaking time is more than 40min;

[0035] S2. The starting temperature of rough rolling is set at 1073°C, the finishing temperature of rough rolling is 985°C, the reduction rate of the penultimate pass of rough rolling is more ...

Embodiment 2

[0040] 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: 0.01% ~0.02%, Ca: 0.001%~0.003%, Al: 0.02%~0.04%, the balance is Fe and unavoidable impurities, Ceq: 0.16~0.23%, Pcm: 0.07~0.13%.

Embodiment 3

[0042] 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: 0.030%-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: 0.01% ~0.02%, Ca: 0.001%~0.003%, Al: 0.01%~0.03%, the balance is Fe and unavoidable impurities, Ceq: 0.16~0.23%, Pcm: 0.07~0.13%.

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Abstract

The invention discloses a B-stage acid-resistant pipeline steel plate and a rolling process thereof. The B-stage acid-resistant pipeline steel plate is prepared from the following chemical componentsin percentage by mass: 0.010%-0.040% of C, 0.10%-0.30% of Si, 0.80%-0.90% of Mn, less than or equal to 0.015% of P, less than or equal to 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 and the balance of Fe and inevitable impurities, wherein Ceq is 0.16-0.23%, and Pcm is 0.07-0.13%. The B-stage acid-resistant pipeline steel plate adopts a low-temperature austenitizing process to effectively refine structure crystalline grains, improves adverse effect of a belt-shaped structure, and meetsacid and corrosion resistance of products.

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 rolling 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 and the strict requirements on product quality, few companies have the qualifications to supply pipelines. For B-level acid-resistant export pipelines, Nb has always been used for tax rebates. Nb has a great effect on product microalloying and can refine the microstructure Granularity, anti-acid performance has no side effects, but the cost is higher. Conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D8/02
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