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A kind of recrystallization annealing control stainless spring steel wire forming manufacturing method

A technology of recrystallization annealing and spring steel wire, which is applied in the field of stainless steel springs, can solve the problems of affecting mechanical properties, coarse austenite grains, high solution temperature, etc., achieve softening and prevent intergranular corrosion, and improve resistance to intergranular corrosion effect of ability

Active Publication Date: 2022-07-26
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application CN201910332233.4 discloses that solution softening treatment is required in the cold drawing preparation process of stainless spring steel wire, but the solution temperature is high and the austenite grains are coarse, which seriously affects the mechanical properties

Method used

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  • A kind of recrystallization annealing control stainless spring steel wire forming manufacturing method
  • A kind of recrystallization annealing control stainless spring steel wire forming manufacturing method
  • A kind of recrystallization annealing control stainless spring steel wire forming manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepared sample (wt%), C: 0.05, Si: 0.4, Mn: 1.2, S: ≤ 0.025, P: ≤ 0.030, N: ≤ 0.16, Cr: 18.0, Ni: 9.0, Nb: 0.1, Ti: 0.2, Al: 0.3, and the rest are Fe.

[0040]The raw materials are loaded into the furnace and evacuated to 1Pa, and then nitrogen is passed through. After smelting at 1560 ℃, pouring at 1520 ℃. The ingot is heated to 1100℃ and rolled into a steel wire with a diameter of 5.5mm at 3~4m / min, and then water-cooled and dried. Treat with 20% AM500 coating agent at 90℃ and dry at 200℃. Using sodium stearate as a lubricant, the steel wire with diameters of 4.6, 3.7, 3.1, 2.6, 2.2, and 2.0mm is automatically and continuously cold drawn in a tungsten carbide die, and the wire exit speed is about 280m / min. Use sulfuric acid concentration of 10%, single DC 5A, 24V for electrolytic pickling, washing and drying. The 2.0mm steel wire was put into an annealing furnace with an ammonia gas atmosphere of 80ml / min at 6m / min, recrystallized and annealed at 900°C, and the fu...

Embodiment 2

[0042] Prepared sample (wt%), C: 0.04, Si: 0.3, Mn: 0.8, S: ≤ 0.030, P: ≤ 0.035, N: ≤ 0.2, Cr: 16.0, Ni: 8.0, Nb: 0.1, Ti: 0.1, Al: 0.4, and the rest are Fe.

[0043] The raw materials are loaded into the furnace and evacuated to 0.1Pa, and then nitrogen is passed through. After smelting at 1550 ℃, pouring at 1520 ℃. The ingot is heated to 1200℃ and rolled into a steel wire with a diameter of 5.5mm at 3~4m / min, and then water-cooled and dried. Treat with 18% AM500 coating agent at 88°C and dry at 200°C. Using sodium stearate as a lubricant, the steel wire with diameters of 4.6, 3.7, 3.1, 2.6, 2.2 and 2.0mm is automatically and continuously cold drawn in a tungsten carbide die, and the wire exit speed is about 250m / min. Use sulfuric acid with a concentration of 8%, single DC 5A, 24V for electrolytic pickling, washing and drying. The 2.0mm steel wire was put into the annealing furnace with 80ml / min ammonia gas atmosphere at 6m / min, and the 920°C recrystallization annealing fu...

Embodiment 3

[0045] Prepared sample (wt%), C: 0.06, Si: 0.8, Mn: 1.5, S: ≤ 0.025, P: ≤ 0.030, N: ≤ 0.2, Cr: 19.0, Ni: 11.0, Nb: 0.3, Ti: 0.3, Al: 0.5, and the rest are Fe.

[0046] The raw materials are loaded into the furnace and evacuated to 1Pa, and then nitrogen is passed through. After smelting at 1580 ℃, pouring at 1520 ℃. The ingot is heated to 1200℃ and rolled into a steel wire with a diameter of 5.5mm at 3~4m / min, and then water-cooled and dried. Treat with 20% AM500 coating agent at 90℃ and dry at 200℃. Using sodium stearate as a lubricant, the steel wire with diameters of 4.6, 3.7, 3.1, 2.6, 2.2, and 2.0mm is automatically and continuously cold drawn in a tungsten carbide die, and the wire exit speed is about 280m / min. Use sulfuric acid with a concentration of 10%, single DC 5A, 24V for electrolytic pickling, washing and drying. The 2.0mm steel wire was put into the annealing furnace with 80ml / min ammonia gas atmosphere at 8m / min, and the 950°C recrystallization annealing fur...

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Abstract

The invention discloses a manufacturing method for recrystallization annealing regulating and controlling the forming of stainless spring steel wire. : ≤0.035, N: ≤0.2, Cr: 16.0~19.0, Ni: 8.0~11.0, Nb: 0.1~0.3, Ti: 0.1~0.3, Al: 0.3~0.5, and the rest are Fe. Control the molar ratio of Al:N to be greater than 1, so that Ti and Nb form a strengthening phase, refine grains, improve strength, and prevent Cr 23 C 6 Type carbide and σ phase precipitation, improve the resistance to intergranular corrosion. Design components, vacuum through nitrogen smelting solution hot rolling, then cold drawing, and then adjusting the recrystallization annealing temperature and time to control the formability, and finally cold drawing into a high-strength corrosion-resistant stainless spring steel wire with a diameter of 0.7mm.

Description

technical field [0001] The invention belongs to the field of stainless steel springs, and in particular relates to a method for forming and manufacturing a recrystallization annealing control stainless spring steel wire. Background technique [0002] Spring is a kind of elastic element widely used in machine equipment and electronic industry. Many electrical appliances and precision instruments require springs to ensure both good corrosion resistance and high strength. As the most widely used austenitic stainless steel, 304 austenitic stainless steel has the advantages of high toughness and plasticity, easy machinability and good corrosion resistance, and is widely used in aerospace, petrochemical, transportation, etc. All industrial fields. However, the yield strength and hardness of 304 stainless steel are relatively low, and the fatigue resistance, friction and wear resistance and local corrosion resistance are still insufficient, which seriously limits its application....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04C21D1/26C21D9/52C22C33/04C22C38/00C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50
CPCB21C37/047C22C38/02C22C38/04C22C38/001C22C38/06C22C38/48C22C38/50C22C33/04C21D1/26C21D9/525C21D2211/001
Inventor 贺显聪赵秀明吴萌
Owner NANJING INST OF TECH
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