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Method for producing steel for pipe fittings and steel for pipe fittings

A production method and technology for pipe fittings, which is applied in the production of steel for electric power pipe fittings and the field of steel for electric power pipe fittings, can solve the problems of good plasticity and toughness, low manufacturing cost, and inability to produce strength, so as to improve safety and reduce the total amount of steel used , the effect of good elongation

Active Publication Date: 2015-04-22
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention provides a production method of steel for electric power pipe fittings and steel for electric power pipe fittings, so as to solve the technical problems in the prior art that the strength, good plastic toughness and low manufacturing cost cannot be produced.

Method used

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  • Method for producing steel for pipe fittings and steel for pipe fittings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The 220 tons of molten steel smelted in a converter and refined outside the furnace are continuously cast into billets, and the weight percentages are C: 0.16%, Si: 0.13%, Mn: 0.59%, P: 0.012%, S: 0.004%, Al: 0.042%, Ti: 0.08%, N: 0.004%, and the rest are Fe and unavoidable impurities. The thickness of the slab is 230mm.

[0062] Rolling is carried out in the 1580 hot continuous rolling production line, the heating temperature is 1210°C, the finish rolling entrance temperature is 970°C, the final rolling temperature is 820°C, the target thickness is 6mm, and after rolling, it is cooled to the target coiling temperature of 590 by laminar cooling. ℃, air-cooled to room temperature after coiling.

[0063] The yield strength Rel of the high-strength steel produced according to the above method is 465MPa, the tensile strength is 550MPa, the elongation is 26%, and the cold bending D=1.5a has no cracks on the surface (D is the diameter of the bending core, a is the thickness ...

Embodiment 2

[0065] The molten steel smelted in a 220-ton converter and refined outside the furnace was continuously cast into a slab, and its weight percentage was the same as in Example 1. The thickness of the slab is 230mm.

[0066] Rolling is carried out in the 1580 hot continuous rolling production line, the heating temperature is 1240°C, the finish rolling entrance temperature is 990°C, the final rolling temperature is 840°C, the target thickness is 4mm, after rolling, it is cooled by laminar flow to the target coiling temperature of 570°C , and air-cool to room temperature after coiling.

[0067] The yield strength Rel of the high-strength steel produced according to the above method is 470MPa, the tensile strength is 565MPa, the elongation is 24%, and there is no crack on the surface of the cold-formed D=1.5a.

Embodiment 3

[0069] The molten steel smelted in a 220-ton converter and refined outside the furnace was continuously cast into a slab, and its weight percentage was the same as in Example 1. The thickness of the slab is 230mm.

[0070] Rolling is carried out in the 1580 hot continuous rolling production line, the heating temperature is 1200°C, the finish rolling entrance temperature is 960°C, the final rolling temperature is 800°C, the target thickness is 8mm, and after rolling, it is cooled by laminar flow to the target coiling temperature of 590°C , and air-cool to room temperature after coiling.

[0071] The yield strength Rel of the high-strength steel produced according to the above method is 465MPa, the tensile strength is 545MPa, the elongation is 23%, and there is no crack on the surface of the cold-formed D=1.5a. -20°C Charpy impact absorption energy is 86J (sample size 5*10*55mm).

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Abstract

The invention relates to the technical field of steelmaking and discloses a method for producing steel for pipe fittings and steel for the pipe fittings. The method comprises the following steps: smelting in a converter or an electric furnace, refining in an LF (ladle furnace) or RH vacuum treatment process, continuous casting, heating, rough rolling, finishing rolling, laminar cooling process and coiling, wherein the following process parameters are controlled: during the continuous casting process, the superheat range is 20-35 DEG C, the casting speed is controlled at the range of 0. 9-1.1 / min and strong cooling and large reduction are adopted in the solidification tail end; during the continuous casting process, a secondary cooling schedule is adopted for control and a cooling schedule in which the cooling speed of the front section is higher than that of the rear section in the secondary cooling section is adopted; during the heating process, a slab is heated to 1200-1240 DEG C in the heating furnace and the soaking time is greater than 180 minutes; during the finishing rolling process, the finishing rolling inlet temperature is 950 DEG C-990 DEG C and the finish rolling temperature is 800-840 DEG C; and during the coiling process, the target coiling temperature is 570 DEG C-590 DEG C.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and discloses a production method of steel for electric power pipe fittings and steel for electric power pipe fittings. Background technique [0002] With the rapid development of my country's economy, the amount of power transmission continues to increase, and the demand for power towers continues to increase. On the one hand, it is manifested in the improvement of material strength, and at the same time, higher requirements are put forward for the safety of power towers. Most of the traditional power towers commonly used in my country are angle steel welded structures, and the main grades used are Q345B, Gr65, ASTM A572, etc. This kind of angle steel welded structure power towers uses a large amount of steel and is easily corroded, causing safety hazards. The environment is relatively sensitive, and the collapse of power towers caused by low temperature weather has been reported. In order t...

Claims

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Application Information

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IPC IPC(8): C22C38/14
Inventor 潘辉李飞朱国森周娜刘国梁王伦包春林吴科敏惠亚军
Owner SHOUGANG CORPORATION
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