Low-yield-ratio high-strength steel for tank car and manufacturing method of high-strength steel
A low-yield-ratio, high-strength steel technology is applied in the field of high-strength steel for low-yield ratio tank cars and its manufacturing. It can solve the problems of long production process, unfavorable mass production, and high alloy cost, and achieve low production cost and high-quality strength. The effect of matching toughness and reducing the yield-strength ratio
Inactive Publication Date: 2020-09-11
JIUJIANG PINGGANG STEEL
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[0035] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0036] The chemical composition of a high-strength steel for tank cars with a low yield ratio is C: 0.08-0.15%, Si: 0.05-0.20%, Mn: 1.50-2.00%, P≤0.012%, S≤0.005%, Cr Ni: 0.32-0.45%, Ni: 0.10-0.20%, Nb: 0.02-0.07%, and the balance is Fe and unavoidable impurity elements.
[0037] Satisfy at the same time: Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15≤0.50%.
[0038] The properties of the high-strength steel for tank cars with low yield ratio of the present invention meet: yield strength ≥ 400MPa, tensile strength Rm ≥ 610MPa, elongation A 50 ≥32%, yield ratio ≤0.75, transverse impact energy -50℃KV 2 ≥47J.
[0039] The invention also discloses a method for manufacturing high-strength steel for tank cars with a low yield ratio. The process flow of the method is: blast furnace molten iron, KR treatment of molten iron, 120-160t oxygen converter smelting, LF ladle fu...
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Abstract
The invention discloses low-yield-ratio high-strength steel for a tank car and a manufacturing method of the high-strength steel. The high-strength steel comprises the following chemical components of, in percentage by mass, 0.08%-0.15% of C, 0.05%-0.20% of Si, 1.50%-2.00% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.005% of S, 0.32%-0.45% of Cr, 0.10%-0.20% of Ni and 0.02%-0.07% of Nb, and the balance being Fe and inevitable impurity elements; and meanwhile, Ceq = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15 < / = 0.50%. The high-strength steel for the tank car is produced by adopting a C-Mn-Cr system and supplemented with an Nb and Ni microalloyed component system and a normalizing process, has the characteristics of low yield ratio, high strength, high plasticity and excellent low-temperature toughness, and is short in production process flow, low in cost and suitable for batch production.
Description
technical field [0001] The invention relates to a high-strength steel for tank cars with a low yield ratio and a manufacturing method thereof. Background technique [0002] After decades of rapid economic development, my country's oil consumption is increasing day by day, and environmental pollution and other issues are becoming increasingly prominent. With the awakening of national awareness of environmental protection, my country's energy-saving emission reduction and environmental protection policies are gradually promoted and implemented. The market's requirements for mobile tankers are becoming more and more stringent. Those mobile tankers with small volume-to-weight ratio and low carrying efficiency are gradually eliminated. has become a trend. Since my country began to use 600MPa high-strength steel at the beginning of the 21st century, the volume of mobile tankers has become larger and smaller, and the volume-to-weight ratio has become smaller and smaller. With the ...
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IPC IPC(8): C22C38/58C22C38/48C22C38/02C22C33/06B22D11/04C21D8/02C21D1/28
CPCB22D11/04C21D1/28C21D8/0205C21D8/0247C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/002C22C38/02C22C38/48C22C38/58
Inventor丁庆丰
OwnerJIUJIANG PINGGANG STEEL