Duplex stainless steel wire rod, steel wire and bolt and manufacturing method thereof

A technology for steel wire rods and bolts, applied in the field of duplex stainless steel wire rods and soft duplex stainless steel wire rods, can solve the problems of not considering softness, high tensile break shrinkage characteristics, and difficulty in cold workability of wire rods, and achieve excellent cold forging. sexual effect

Active Publication Date: 2012-02-01
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the examples, the steel containing 0.08% or more of nitrogen to improve the strength is described in order to improve the deep drawability of the steel sheet by improving the ductility. Cold workability is difficult
[0022] As mentioned above, among the conventional stainless steels, there is no stainless steel that has the softness and high fracture shrinkage characteristics necessary for the cold workability of wire rods, and is inexpensive and exhibits high corrosion resistance and magnetization.

Method used

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  • Duplex stainless steel wire rod, steel wire and bolt and manufacturing method thereof
  • Duplex stainless steel wire rod, steel wire and bolt and manufacturing method thereof
  • Duplex stainless steel wire rod, steel wire and bolt and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Embodiment 1 of the present invention will be described below.

[0142] Tables 1 to 4 show the chemical composition of the steel of Example 1.

[0143]

[0144]

[0145]

[0146]

[0147] Melt the steel with the above chemical composition in a 300kg vacuum melting furnace, cast it into a 180mm slab, and roll the slab to 5.5~6.5mm by wire rod hot rolling, finish the hot rolling at 1050°C, and then pass the on-line heat treatment The solution treatment was carried out by holding at 1050° C. for 5 minutes and cooling in water, and thereafter, pickling was carried out to obtain a wire product. Then, oxalic acid film treatment is performed, and light cold drawing is processed to φ5.2mm, and it is finished into a steel wire for cold forging.

[0148] Then, about 5,000 hexagon bolts are processed by cold forging and rolling. Then, an aging treatment is performed at 300 to 650° C. and held for 3 to 200 minutes on a part thereof. Then, all the bolts are finished i...

Embodiment 2

[0160] Embodiment 2 of the present invention will be described below.

[0161] Tables 9 and 10 show the chemical composition (mass) of the steel (test material) used in Example 2.

[0162]

[0163]

[0164] Melt the steel with the above chemical composition in a 150kg vacuum melting furnace, cast it into a 180mm slab, and roll the slab to 5.5mm by wire rod hot rolling, and finish the hot rolling at 1050°C. In this state, it is carried out at 1050 ℃ for 5 minutes, water-cooled continuous heat treatment, and then pickled to make a wire. Then, the steel wire is cold-drawn to φ2.0 mm by a normal process, and the steel wire is cold-worked into a mesh-like metal mesh for a conveyor belt by bending.

[0165] Evaluation: The tensile strength, tensile fracture shrinkage, cold workability, corrosion resistance, and magnetizability of the wire rod were evaluated. The evaluation results are shown in Tables 11 and 12.

[0166] Table 11

[0167]

[0168] Table 12

[0169]

...

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PUM

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Abstract

This austenite-ferrite duplex steel wire material for high strength highly corrosion resistant bolts, which has excellent cold forgeability and contains, in terms of mass %, C: 0.005 to 0.05%, Si: 0.1 to 1.0%, Mn: 0.1 to 10.0%: Ni: 1.0 to 6.0%, Cr: 19.0 to 30.0%, Cu: 0.05 to 3.0%, and N: 0.005 to 0.20%, with a remainder being iron and unavoidable impurities, wherein C+N is not more than 0.20%, an M value represented by formula (a) below is not more than 60, an F value represented by formula (b) below is from 45 to 85, and the tensile strength is within a range from 550 to 750 N / mm 2 . M = 551 - 462 �¢ C + N - 9.2 �¢ Si - 8.1 �¢ Mn - 29 �¢ Ni + Cu - 13.7 �¢ Cr - 18.5 �¢ Mo F = 5.6 �¢ Cr - 7.1 �¢ Ni + 2.4 �¢ Mo + 15 �¢ Si - 3.1 �¢ Mn - 300 �¢ C - 134 �¢ N - 26.6

Description

technical field [0001] The present invention relates to a duplex stainless steel wire rod excellent in cold forgeability, and provides, for example, a high-strength bolt having corrosion resistance equivalent to that of SUS304 at low cost. [0002] The present invention relates to a soft duplex stainless steel wire material with magnetizability and excellent cold workability, and more specifically to screws, pins, metal meshes, steel wires, steel cables, springs, etc., which can be provided at low cost and have corrosion resistance equivalent to, for example, SUS304 and SUS316 Soft duplex stainless steel wire material with strong cold workability and excellent cold workability with magnetization imparted at the same time. [0003] This application claims priority based on Japanese Patent Application No. 2007-264992 filed in Japan on October 10, 2007, and Japanese Patent Application No. 2007-264993 filed in Japan on October 10, 2007, the contents of which are incorporated herei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D6/00C21D9/00C22C38/58
CPCC21D6/02C22C38/42C22C38/002C22C38/02C21D2211/005C21D9/56C22C38/58C21D2211/001C22C38/44C22C38/001C21D8/06C21D6/004C21D7/02C21D8/065C21D9/0093C21D9/02C21D9/525
Inventor 高野光司柘植信二天藤雅之森祐司多田好宣
Owner NIPPON STEEL STAINLESS STEEL CORP
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