Atmosphere-corrosion-resistant cold heading steel hot rolled wire rod with grade being 10.9 and production method thereof

A technology of hot-rolled wire rods resistant to atmospheric corrosion, which is applied in the field of hot-rolled wire rods of 10.9-grade atmospheric corrosion-resistant cold heading steel for weather-resistant bolts and its production field, which can solve the problems of unreachable strength and achieve good surface quality and appearance quality Excellent, good corrosion effect

Inactive Publication Date: 2017-03-15
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent No. 201210122948.5 provides a highly corrosion-resistant weather-resistant submerged arc welding wire and wire rod for railway vehicles. This patent is mainly aimed at a kind of steel for welding wire. Although the welding performance is good, the strength cannot reach 10.9 tightness. Steel requirements for fasteners

Method used

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  • Atmosphere-corrosion-resistant cold heading steel hot rolled wire rod with grade being 10.9 and production method thereof
  • Atmosphere-corrosion-resistant cold heading steel hot rolled wire rod with grade being 10.9 and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: This 10.9-grade atmospheric corrosion-resistant cold-heading steel hot-rolled wire rod is produced by the following method.

[0017] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into slabs, the composition of which is by weight percentage: C 0.32%, Si0.20%, Mn 0.82%, P 0.020%, S 0.010%, Cr 0.81%, Ni 0.24%, Cu 0.25%, the rest is iron, and the corrosion resistance index is I=6.4.

[0018] (2) Heating process: heat the billet to 1100°C and hold for 85 minutes; then dephosphorize with high-pressure water at a temperature of 1040°C, requiring a water pressure of at least 10MPa.

[0019] (3) Rolling process: the dephosphorized steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of entering and finishing rolling is 895°C. After finishing rolling, spinning The temperature is controlled at 880°C.

[0020] (4) Cooling pr...

Embodiment 2

[0022] Example 2: This 10.9-grade atmospheric corrosion-resistant cold heading steel hot-rolled wire rod is produced by the following method.

[0023] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, and its composition by weight percentage is: C 0.28%, Si0.22%, Mn 0.80%, P 0.021%, S 0.013%, Cr 0.83%, Ni 0.26%, Cu 0.26%, the rest is iron, and the corrosion resistance index is I=6.6.

[0024] (2) Heating process: heat the steel billet to 1080°C, hold for 90 minutes; then remove phosphorus with high-pressure water, the temperature of phosphorus removal is 1020°C, and the water pressure for phosphorus removal is required to be at least 10MPa.

[0025] (3) Rolling process: the dephosphorized steel billet is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of finishing rolling is 905°C. After finishing rolling, spinning The temperatu...

Embodiment 3

[0028] Embodiment 3: This 10.9-grade atmospheric corrosion-resistant cold-heading steel hot-rolled wire rod is produced by the following method.

[0029] (1) Smelting and continuous casting process: molten steel is smelted and continuously cast into steel slabs, and its composition by weight percentage is: C 0.30%, Si0.15%, Mn 0.85%, P 0.022%, S 0.012%, Cr 0.79%, Ni 0.35%, Cu 0.50%, the rest is iron, and the corrosion resistance index is I=6.4.

[0030] (2) Heating process: heat the steel billet to 1100°C, hold for 100 minutes; then remove phosphorus with high-pressure water, the temperature of phosphorus removal is 1040°C, and the water pressure for phosphorus removal is required to be at least 10MPa.

[0031] (3) Rolling process: the slab after dephosphorization is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finish rolling, 8 passes of finish rolling, and the temperature of finishing rolling is 900°C. After finishing rolling, spinning The temp...

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Abstract

The invention discloses an atmosphere-corrosion-resistant cold heading steel hot rolled wire rod with the grade being 10.9. The atmosphere-corrosion-resistant cold forging steel hot rolled wire is composed of, by weight, 0.25-0.35% of C, 0.15-0.35% of Si, 0.60-0.90% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.60-0.90% of Cr, 0.20-0.50% of Ni, 0.20-0.50% of Cu and the balance of Fe and trace impurities. According to the hot rolled wire rod, through the optimal design of chemical components, and by adding alloy elements such as Cu and Cr, a compact amorphous metal film which is closely combined with a substrate is naturally formed on a fastener through surface rust in the using process, so that the material has the atmosphere-corrosion-resistant effect; by adding an alloy element of Ni, the material has the good surface quality during hot rolling, the surface is free of obvious cracking phenomenon in the subsequent drawing and cold heading processes; and the hot rolled wire rod has the characteristics of being good in mechanical performance, corrosion resistance and formability and the like.

Description

technical field [0001] The invention relates to a hot-rolled wire rod and a production method thereof, in particular to a 10.9-grade atmospheric corrosion-resistant cold heading steel hot-rolled wire rod for weather-resistant bolts and a production method thereof. Background technique [0002] High strength and long life have always been the research direction of metal materials. High-strength connecting bolts are used to connect steel structures. In the design of steel structures, high-strength bolts play the role of connecting, fastening and positioning. The bolts of the components present high design stresses and light weight requirements. The most effective measure for this is to increase the strength of bolt steel. [0003] It is understood that weathering steel in the United States, Canada, Japan, Europe and other countries has been widely used, but in China, the application range of weathering steel is not large. At present, major domestic steel mills have begun to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/18C22C38/16C21D8/02
CPCC22C38/02C21D8/02C21D2211/00C22C38/04C22C38/08C22C38/16C22C38/18
Inventor 翟进坡陈继林陶晓燕田新中刘晓光张治广崔娟郭明仪张松琦阮士朋李永超牛斌沈家华赵欣欣王利军张鹏黄翠环刘超王宁涛冯忠贤回士旭阎丽珍
Owner XINGTAI IRON & STEEL
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