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One-steel multistage blank production method

A production method and billet technology are applied in the field of multi-stage billet production of a steel, which can solve the problems of reducing the continuous casting operation rate, increasing the continuous casting time, increasing the continuous casting group change time, etc., so as to improve the continuous casting operation rate and realize the universality. The effect of using and reducing capital turnover

Inactive Publication Date: 2020-01-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the steel plate manufacturing process, due to the influence of the qualified rate of rolled products and the weight of the heat, it is difficult to digest all the smelted blanks in one order. There may be hundreds of steel types developed by the company. If each steel The ingredients are designed and developed by the R&D personnel themselves. After the order is completed, there will be a part of the billet balance, resulting in surplus billets. It is difficult for other R&D personnel to find this part of the billet, so the utilization rate is very low.
The excess billet occupies a high rate of funds for the enterprise, and at the same time leads to a high cost of steel grades
Scattered steel grades will make smelting and production scheduling difficult. During the continuous casting process of different steel grades, due to the large fluctuations in the composition of the continuous casting section, the amount of downgrading and rejudgment is large, and the waste in the smelting process is serious. The scattered steel grades are low in order and often cannot satisfy a middle One group of steel can produce 20 furnaces, but due to the order quantity, it can only produce about 10 furnaces, which increases the time for continuous casting group replacement, reduces the continuous casting operation rate, and reduces the crude steel output of the enterprise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of one-steel multistage billet production method provided in this embodiment comprises

[0051] S1. In the national standard GB / T 1591, the composition requirements of low-alloy high-strength structural steel Q390 are: C≤0.20%, Si≤0.55%, Mn≤1.70%, P≤0.025%, S≤0.025%, Nb≤0.050% , V≤0.13%, Cr≤0.30%, Ti≤0.05%, Ni≤0.50%, Cu≤0.40%, Mo≤0.10%, N≤0.015;

[0052] In the national standard GB / T 3531, the composition requirements of 15MnNiNbDR steel plates for low temperature pressure vessels are: C≤0.18%, Si: 0.15%~0.50%, Mn: 1.20%~1.60%, P≤0.020%, S≤0.008%, Ni : 0.30%~0.70%, Nb: 0.015%~0.70%;

[0053] S2. According to product quality, cost, and performance requirements, select medium-carbon steel composition design, and set the carbon equivalent to 0.40% to 0.43%;

[0054] S3. On the basis of meeting the product manufacturing standards and specifications, integrate the two ordered products in S1 into a general product, and the composition design is: C: 0.16%~0.18%, Mn: 1...

Embodiment 2

[0059] A kind of one-steel multistage billet production method provided in this embodiment comprises

[0060] S1. The chemical composition requirements for high-strength hull structure steel FH 32 / 36 / 40 in CCS for materials and welding are: C≤0.16%, Si≤0.50%, Mn: 0.90%~1.60%, P≤0.025%, S≤0.025%, Nb: 0.02%~0.05%, V: 0.05%~0.10%, Cr≤0.20%, Ti≤0.02%, Ni≤0.80%, Cu≤0.35%, Mo≤0.08%, N≤0.009% , Al≥0.015%, Nb+V+Ti≤0.12%; when two or more grain-refining elements are used in Al, Nb, and V, the lower limit of a single element does not apply;

[0061] In the API specification, the chemical composition requirements of steel for PSL2 of X60M~X65M pipelines are: C≤0.12%, Si≤0.45%, Mn≤1.60%, P≤0.025%, S≤0.015%, Nb+V+Ti≤0.15% , Ni≤0.50%, Cr≤0.50%, Cu≤0.50%, Mo≤0.50%, Ceq≤0.43%, Pcm≤0.25%;

[0062] S2. Select low-carbon steel composition design according to quality, cost, and performance requirements, and set the carbon equivalent to 0.40% to 0.43%;

[0063] S3. On the basis of meeting the p...

Embodiment 3

[0068] A kind of one-steel multistage billet production method provided in this embodiment comprises

[0069] The composition requirements of S1 and Q55O steel plate technical agreements are: C≤0.012%, Si≤0.60%, Mn≤2.00%, P≤0.025%, S≤0.020%, Nb≤0.060%, V≤0.08%, Cr≤0.80% , Ti≤0.20%, Ni≤0.80%, Cu≤0.80%, Mo≤0.30%, N≤0.015, B≤0.004%, Al≥0.015%;

[0070] The composition requirements of the technical agreement for thick gauge pipe piles are: C≤0.12%, Si≤0.45%, Mn≤1.70%, P≤0.025%, S≤0.015%, Cr≤0.50%, Ni≤0.50%, Mo≤0.50% , Cu≤0.50%, B≤0.001%, Nb+V+Ti≤0.15%;

[0071] S2. Select low-carbon steel composition design according to quality, cost, and performance requirements, and set the carbon equivalent to 0.38% to 0.45%;

[0072] S3. On the basis of meeting the product manufacturing standards and specifications, integrate the above two ordered products into a general product, and the composition design is: C: 0.04%~0.07%, Mn: 1.5%~1.7%, Si: 0.20%~ 0.30%, P≤0.015%, S≤0.005%, Nb: 0.40%~0....

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Abstract

The invention discloses an one-steel multistage blank production method, and relates to the technical field of steel and iron smelting. Four types of products are defined according to casting properties and product characteristics; and on this basis, components are designed according to product performance requirements and strength levels for carbon equivalents to optimize the structures of the products, so that the use generality of smelting blanks is achieved, the blank steel number is reduced, the excess blank stock is greatly reduced, the structure production scheduling is convenient, andthe continuous casting operation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for producing a multi-stage billet of one steel. Background technique [0002] In the steel plate manufacturing process, due to the influence of the qualified rate of rolled products and the weight of the heat, it is difficult to digest all the smelted blanks in one order. There may be hundreds of steel types developed by the company. If each steel The ingredients are designed and developed by the R&D personnel themselves. After the order is completed, there will be a part of the billet balance, resulting in surplus blanks. It is difficult for other R&D personnel to find this part of the surplus blanks, so the utilization rate is very low. The excess billet occupies a high rate of funds for the enterprise, and at the same time leads to a high cost of steel grades. Scattered steel grades will make smelting and production scheduling difficult. During the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C33/04
CPCC22C33/04C22C38/002C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 翟冬雨洪君吴俊平方磊姜金星杜海军刘帅陈飞刘汝营张臣臣严生平丁叶
Owner NANJING IRON & STEEL CO LTD
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