Low crack sensitivity steel plate with yield strength 500MPa and manufacturing method thereof

A technology of yield strength and manufacturing method, applied in the field of iron and steel metallurgy, can solve the problems of high smelting cost, high price, complex manufacturing process, etc., and achieve the effects of excellent welding performance, loose process system, and reduced raw material cost.

Active Publication Date: 2009-07-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Cr, Cu, Mo, and Ni are all precious alloying elements, especially Mo and Ni are more expensive, so from the analysis of the types of alloying elements added, the smelting costs of the

Method used

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  • Low crack sensitivity steel plate with yield strength 500MPa and manufacturing method thereof
  • Low crack sensitivity steel plate with yield strength 500MPa and manufacturing method thereof
  • Low crack sensitivity steel plate with yield strength 500MPa and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The proportion of chemical elements in the steel of the present invention is: C: 0.01%, Si: 0.65%, Mn: 2.00%, P≤0.010%, S≤0.006%, Nb: 0.090%, Al: 0.050%, Ti: 0.030% , B: 0.0025%, the balance is Fe and unavoidable impurities.

[0042] The manufacturing method is as follows: the heating temperature is 1080°C, and the heat preservation is 120 minutes; the starting rolling temperature of the first stage rolling is 1060°C, and the thickness of the rolled piece is 90mm; the starting rolling temperature of the second stage rolling is 780°C, and the final rolling temperature is 740°C, the thickness of the finished steel plate is 30mm; the cooling rate of the steel plate is 15°C / S, and the termination temperature is 450°C.

Embodiment 2

[0044] The proportion of chemical elements in the steel of the present invention is: C: 0.02%, Si: 0.60%, Mn: 1.80%, P≤0.010%, S≤0.006%, Nb: 0.080%, Al: 0.060%, Ti: 0.025% , B: 0.0020%, the balance is Fe and unavoidable impurities.

[0045] The manufacturing method is as follows: the heating temperature is 1100°C, and the heat preservation is 160 minutes; the starting rolling temperature of the first stage rolling is 1090°C, and the thickness of the rolled piece is 100mm; the starting rolling temperature of the second stage rolling is 780°C, and the final rolling temperature is 770°C, the thickness of the finished steel plate is 40mm; the cooling rate of the steel plate is 5°C / S, and the termination temperature is 560°C.

Embodiment 3

[0047] The proportion of chemical elements in the steel of the present invention is: C: 0.04%, Si: 0.50%, Mn: 1.65%, P≤0.010%, S≤0.006%, Nb: 0.060%, Al: 0.055%, Ti: 0.020% , B: 0.0015%, the balance is Fe and unavoidable impurities.

[0048] The manufacturing method is as follows: the heating temperature is 1120°C, and the heat preservation is 150 minutes; the starting temperature of the first stage rolling is 1100°C, and the thickness of the rolled piece is 150mm; the starting temperature of the second stage rolling is 800°C, and the final rolling temperature is 790°C, the thickness of the finished steel plate is 60mm; the cooling rate of the steel plate is 12°C / S, and the termination temperature is 500°C.

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Abstract

The invention discloses a crack sensitivity steel plate with the yield strength of 500MPa, which is characterized by comprising the following chemical elements in terms of weight percentage: 0.010 to 0.09 percent of C, 0.10 to 0.65 percent of Si, 1.10 to 2.00 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.006 percent of S, 0.020 to 0.090 percent of Nb, 0.02 to 0.06 percent of Al, 0.004 to 0.030 percent of Ti, 0.0005 to 0.0025 percent of B and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting and casting the raw materials into casting blank or steel ingot; 2) heating; 3) rolling; and 4) entering a cooling accelerator, cooling till the temperature of 450 to 560 DEG C, and air cooling after water drainage. The crack sensitivity steel plate has little sensitivity of welded crack, and the welding performance is good when the yield strength is more than 500MPa.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a steel plate with a yield strength of 500 MPa and low crack sensitivity. Background technique [0002] In order to facilitate welding and simplify the welding process, for high-strength steel used in mechanical structures and engineering construction, the welding crack sensitivity index Pcm of the steel is required to be as low as possible, so as to achieve the purpose of no preheating before welding. This kind of steel is called High-strength steel with low welding crack sensitivity, also known as CF steel. It is a kind of low-alloy high-strength steel with excellent welding performance and low-temperature toughness. Its advantage is that it does not cause cracks without preheating or slightly preheating before welding. It mainly solves the welding construction problem of large steel structures; For steel plates with a yield strength of 500MPa, the Pcm of the steel is ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D9/00
Inventor 赵小婷
Owner BAOSHAN IRON & STEEL CO LTD
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