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A class b acid-resistant pipeline steel plate and its smelting process

A pipeline and steel plate technology, applied in the field of B-grade acid-resistant pipeline steel plate and smelting technology, can solve the problems of acid-resistant pipeline production difficulty, strict product quality requirements, and large microalloying effect, and achieve easy solid solution and Bayesian Body transformation, meet the requirements of acid and corrosion resistance, and reduce the effect of adverse effects

Active Publication Date: 2020-12-18
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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  • A class b acid-resistant pipeline steel plate and its smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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: 0.8%-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%.

[0025] The smelting process of the above grade B acid-resistant pipeline steel plate includes the following steps:

[0026] S1. Use the KR method for desulfurization treatment to ensure that the molten iron S in the furnace is ≤0.002%;

[0027] S2. The converter adopts the top-bottom combined blowing mode, the blowing end point temperature is above 1680°C, the tapping C: 0.031%, P: 0.009%, the sub-lance is used for the terminal oxygen determination, and the tapping deoxidation and alloying are carried out according to the oxygen concentration to ensure The oxygen ...

Embodiment 2

[0032]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: 0.8% ~0.9%, 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

[0034] 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: 0.8%-0.9%, 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%.

[0035] The smelting process of the above grade B acid-resistant pipeline steel plate includes the following steps:

[0036] S1. Use the KR method for desulfurization treatment to ensure that the molten iron S in the furnace is ≤0.002%;

[0037] S2. The converter adopts the top-bottom combined blowing mode, the blowing end point temperature is above 1680°C, the tapping C: 0.038%, P: 0.011%, and the sub-lance is used for terminal oxygen determination, and the tapping deoxidation alloying is carried out according to the oxygen concentration to ensure The oxygen content ...

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Abstract

The invention discloses a B-grade acid-resistant pipeline steel plate and a smelting process. The B-grade acid-resistant pipeline steel plate comprises the following chemical compositions including, by mass, 0.010%-0.040% of C, 0.10%-0.30% of Si, 0.80%-0.90% of Mn, not larger than 0.015% of P, not larger 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 and the balance Fe and unavoidable impurities; and the Ceq is 0.16% to 0.23%, and the Pcm is 0.07% to 0.13%. By means of the B-grade acid-resistant pipeline steel plate and the smelting process, a small number of Nb alloy elements are used, the Mo element is adopted to carry out tax refund treatment, the production cost is effectively reduced, and the requirements for the acid and corrosion resistance performance of products 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 smelting 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. Cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/16C22C38/12C22C38/14C22C38/06C22C33/04C21C5/35C21C7/10C21C7/068C21C7/064B22D11/12
Inventor 翟冬雨刘呈军吴俊平方磊姜金星杜海军员强鹏殷杰
Owner NANJING IRON & STEEL CO LTD
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