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10.9-grade boron-containing spheroidizing-free cold heading steel wire rod and manufacturing method thereof

A technology of cold heading steel and wire rod, which is applied in the field of iron and steel metallurgy and steel rolling, and can solve the problems of environmental pollution, large consumption, and increased use cost

Active Publication Date: 2012-01-18
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spheroidizing annealing process consumes a lot of energy and resources, pollutes the environment, and will reduce the yield, increase the production process, and significantly increase the cost of use. It is estimated that the cost of spheroidizing annealing per ton of steel is more than 300 yuan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 The components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealing cold heading steel in this example are: C: 0.25%; Si: 0.08%; Mn: 0.59%; P: 0.0071%; S: 0.0048% ; Al: 0.027%; Ti: 0.048%; B: 0.0028%; Cr: 1.03%; Ni: 0.03%, and the rest are iron and unavoidable impurity elements. The diameter of the coil is 20mm, and its production process is: electric furnace smelting→external refining→continuous casting of 150 square billets→high-speed wire-controlled rolling→large-coil wire stack cooling. The key control parameters are: (1) tapping temperature 1630°C, tapping temperature Aluminum ingots are used for deoxidation of steel; (2) The refining time is 45 minutes, and alloys are added in the following order: ferromanganese→ferrochrome→aluminum ingot→ferrotitanium→ferroboron, and the soft stirring time is 10 minutes; (3) The rolling temperature is 930 ℃, the coiling temperature is 870℃; (4) after coiling, it is stacked and cooled on the ...

Embodiment 2

[0029] Example 2 The components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealing cold heading steel in this example are: C: 0.27%; Si: 0.06%; Mn: 0.51%; P: 0.0069%; S: 0.0051% ; Al: 0.024%; Ti: 0.045%; B: 0.0024%; Cr: 1.48%; Ni: 0.03%; V: 0.02%; the rest is iron and inevitable impurity elements. The diameter of the coil is 24mm, and its production process is: electric furnace smelting→external refining→continuous casting of 150 square billets→high-speed wire-controlled rolling→large-coil wire stack cooling. The key control parameters are: (1) tapping temperature 1625°C, tapping Aluminum ingots are used for deoxidation of steel; (2) The refining time is 45 minutes, and alloys are added in the following order: ferromanganese→ferrochrome→aluminum ingot→ferrotitanium→ferroboron, and the soft stirring time is 10 minutes; (3) the rolling temperature is 940 ℃, the coil collection temperature is 880℃; (4) after coil collection, it is stacked and cooled...

Embodiment 3

[0030] Example 3 In this example, the components and weight percentages of grade 10.9 boron-containing non-spheroidizing annealing cold heading steel are: C: 0.28%; Si: 0.20%; Mn: 0.76%; P: 0.0060%; S: 0.0056% ; Al: 0.018%; Ti: 0.021%; B: 0.0018%; Cr: 0.58%; Ni: 0.04%, and the rest are iron and unavoidable impurity elements. The diameter of the coil is 12mm, and its production process is: electric furnace smelting→external refining→continuous casting of 150 square billets→high line controlled rolling→Stelmo online controlled cooling. The key control parameters are: (1) Tapping temperature 1650 ℃, use aluminum ingot to deoxidize when tapping; (2) refining time is 45 minutes, add alloy in the following order: ferromanganese→ferrochrome→aluminum ingot→ferrotitanium→ferroboron, soft stirring time is 10 minutes; (3) start rolling The temperature is 940°C, and the winding temperature is 880°C; (4) After winding, the cooling is controlled on the Stelmore line, and the cooling rate is...

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Abstract

The invention discloses a 10.9-grade boron-containing spheroidizing-free cold heading steel wire rod and a manufacturing method thereof. The wire rod comprises the following components in percentage by weight: 0.23 to 0.33 percent of C, 0.02 to 0.20 percent of Si, 0.50 to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.005 to 0.040 percent of Al, 0.005 to 0.050 percent of Ti, 0.0005 to 0.0035 percent of B, 0.58 to 1.50 percent of Cr, 0.01 to 0.05 percent of Ni and the balance of iron and impurities, and also comprises 0.01 to 0.05 weight percent of V preferably. The manufacturing method sequentially comprises the following steps of: smelting; refining outside a furnace; continuously casting; performing high-speed wire controlled rolling; and cooling. The wire rod has the advantages of low hardness, good plasticity, high cold deformability, high hardenability and the like; and the preparation process is simple, and low in cost. In the process of preparing a fastener from the wire rod, a spheroidizing process before drawing can be saved, and the effects of saving energy, reducing pollution, improving yield and reducing use cost are achieved. The product completely meets the production and use requirements of 10.9-grade fasteners.

Description

technical field [0001] The invention relates to a cold heading steel and a production process thereof, in particular to a 10.9-grade boron-containing cold heading steel without spheroidization annealing and a manufacturing method thereof, belonging to the fields of iron and steel metallurgy and steel rolling. Background technique [0002] Cold heading steel is mainly used to manufacture bolts, screws, nuts, studs, rivets and other fasteners, and is widely used in automobiles, machinery, ships, railways, bridges, construction, electronics and other fields. my country is a big producer of cold heading steel. It is estimated that the national output of cold heading steel will reach 9 million tons in 2011, accounting for more than 35% of the world's total. However, at present, domestic cold heading steel still has problems such as low product added value, high production energy consumption, and unstable quality. As a result, high-end products such as cold heading steel for autom...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C33/06C21D8/06B21B37/74
Inventor 麻晗王世芳高利容
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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