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Cr13 type stainless steel wire rod and annealing method thereof

A stainless steel plate and annealing technology, which is applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of long annealing time, difficulty in pickling, high energy consumption of annealing, etc., and achieve easy pickling, increase production efficiency, and reduce oxidation Effect

Inactive Publication Date: 2021-07-16
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The hardness of the wire rod after annealing meets the standard requirements, but the annealing time is long, resulting in serious oxidation and pitting on the surface of the wire rod, difficulty in pickling, high energy consumption and high cost of annealing

Method used

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  • Cr13 type stainless steel wire rod and annealing method thereof
  • Cr13 type stainless steel wire rod and annealing method thereof
  • Cr13 type stainless steel wire rod and annealing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The Cr13 type stainless steel wire rod steel grade of this embodiment is 12Cr13, and the diameter of the wire rod is 5.50 millimeters.

[0049] After the wire rod is rolled, the high-temperature state enters the roller bottom tunnel furnace next to the rolling mill to keep warm for a period of time and then cools to complete the annealing. Among them, the final rolling temperature of the wire rod is 1000°C, and the temperature when the wire rod enters the tunnel furnace is 850°C. The holding temperature of the tunnel furnace is 760°C, the holding time in the tunnel furnace is 60 minutes, and the wire rod is air-cooled after it comes out of the furnace.

[0050] After testing, the hardness HB of the wire rod is 184, which meets the requirement of hardness HB≤187 in the GB / T 1220-2016 standard.

[0051] The surface oxidation degree of the wire rod is low, the pickling time is 20 minutes, and the pickling metal loss is 1.8%.

Embodiment 2

[0053] The Cr13 type stainless steel wire rod steel grade of the present embodiment is 20Cr13, and the diameter of the wire rod is 12 millimeters.

[0054] After the wire rod is rolled, the high-temperature state enters the roller bottom tunnel furnace next to the rolling mill to keep warm for a period of time and then cools to complete the annealing. Among them, the final rolling temperature of the wire rod is 850°C, and the temperature when the wire rod enters the tunnel furnace is 780°C. The holding temperature of the tunnel furnace is 760°C, the holding time in the tunnel furnace is 60 minutes, and the wire rod is air-cooled after it comes out of the furnace.

[0055] After testing, the hardness HB of the wire rod is 190, which meets the requirement of hardness HB≤223 in the GB / T 1220-2016 standard.

[0056] The surface oxidation degree of the wire rod is low, the pickling time is 20 minutes, and the pickling metal loss is 1.9%.

Embodiment 3

[0058] The Cr13 type stainless steel wire rod steel grade of the present embodiment is 30Cr13, and the diameter of the wire rod is 6.50 millimeters.

[0059] After the wire rod is rolled, the high-temperature state enters the roller bottom tunnel furnace next to the rolling mill to keep warm for a period of time and then cools to complete the annealing. Among them, the final rolling temperature of the wire rod is 900°C, and the temperature when the wire rod enters the tunnel furnace is 800°C. The holding temperature of the tunnel furnace is 760°C, the holding time in the tunnel furnace is 60 minutes, and the wire rod is air-cooled after it comes out of the furnace.

[0060] After testing, the hardness HB of the wire rod is 218, which meets the requirement of hardness HB≤235 in the GB / T 1220-2016 standard.

[0061] The surface oxidation degree of the wire rod is low, the pickling time is 18 minutes, and the pickling metal loss is 1.6%.

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Abstract

The invention relates to the field of stainless steel annealing processes, in particular to a Cr13 type stainless steel wire rod and an annealing method thereof. The annealing method of the Cr13 type stainless steel wire rod comprises the following steps that the rolled wire rod is subjected to heat preservation, and then air cooling is conducted. According to the Cr13 type stainless steel wire rod and the annealing method thereof, energy waste caused by the fact that the wire rod is cooled to the room temperature and then heated to the annealing temperature from the room temperature during conventional annealing is avoided, and the annealing method has great practical value and significance in the aspects of improving the quality of the wire rod and saving energy.

Description

technical field [0001] The invention relates to the field of stainless steel annealing technology, in particular to a Cr13 type stainless steel wire rod and an annealing method thereof. Background technique [0002] Cr13 stainless steel wire rod is a kind of stainless steel wire rod with a carbon content of 0.1-0.4% and a chromium content of 11.0-13.0%. Saturated solid solution, high strength, so Cr13 stainless steel wire rod is generally used in structural parts, shafts, high-strength bolts and other fields. [0003] After Cr13 stainless steel is rolled, the high-temperature austenite in the steel will transform into a martensite structure under air-cooling or rapid cooling conditions. This martensite has a high carbon content and a finer lamellar structure. The hardness is high, in order to make the product easy for users to cold process, it must be annealed to reduce the hardness of the wire rod. The effect of annealing transforms the martensite in the steel into ferrit...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/26C21D8/06C21D6/00
CPCC21D9/525C21D1/26C21D8/065C21D6/002C21D2211/008
Inventor 王辉绵田奇闫士彩叶文学
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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