Continuous type alloy steel heat treatment line

A technology of alloy steel and wire pairs, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., to achieve the effect of avoiding quenching deformation, eliminating fire hazards and oil smoke pollution

Active Publication Date: 2012-04-11
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of continuously completing quenching, solid solution and normalizing treatment of small cross-section ultra-long workpieces and adopting discontinuous water quenching instead of oil quenching

Method used

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  • Continuous type alloy steel heat treatment line
  • Continuous type alloy steel heat treatment line
  • Continuous type alloy steel heat treatment line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 2 As shown, the 3Cr17 corrosion-resistant plastic mold flat steel has a thickness of 34mm, a width of 205mm, and a length of 6.0m. The steel is heated by gas in a continuous roller bottom heating furnace. The furnace temperature is ≤200°C and the heating rate is ≤100°C / h. Heating to 1030°C for austenitization and heat preservation for 3 hours; after the heat preservation is completed, the material is quickly discharged and enters the roller bottom quenching tank for water-air quenching (water cooling for 34 seconds→air cooling for 64 seconds→water cooling for 32 seconds). The steel is air-cooled to below 200°C and enters the electric heating continuous roller hearth furnace for tempering, the tempering temperature is 590°C, and the time is 5.5 hours; the tempered steel hardness reaches 30±1HRC, and the bending degree is not more than 2.5mm / m.

Embodiment 2

[0027] Such as image 3 As shown, the austenitic stainless steel 0Cr17Ni4Cu4Nb, the workpiece size is 75mm × 83mm, × 8.5m, is heated by gas in a continuous roller bottom heating furnace, and the temperature is raised to 1020°C for austenitization and heat preservation for 2 hours; after the heat preservation is completed, quickly The material is discharged into the roller bottom quenching tank for water immersion, fog cooling, air cooling and other combined cooling (water cooling for 30 seconds→air cooling for 40 seconds→water cooling for 30 seconds→air cooling for 40 seconds→fog cooling for 60 seconds). After the steel is air-cooled Enter the electric heating continuous roller hearth furnace for tempering below 200°C, and keep the tempering temperature at 635°C for 4 hours. Comprehensive properties: tensile strength 950MPa~1010MPa, yield strength 860MPa~910MPa, elongation after fracture 18%~22%, reduction of area 64%~70%, hardness (HBW) 297~310; bending degree not more than 2...

Embodiment 3

[0029] Such as Figure 4 As shown, Junjia-61 bearing steel ZGCr15, steel size ∮ 80mm ~ 120mm, heated in a continuous roller bottom heating furnace, heated to a temperature of 870 ° C, holding time 3 hours; after the heat preservation is completed, the material is quickly discharged and enters the roller Bottom-type quenching tank, after 30 seconds of water mist cooling (30 seconds of water cooling → 40 seconds of air cooling → 30 seconds of water cooling), the steel is air-cooled to 550 ° C, and then air-cooled to 300 ° C ~ 400 ° C; after electric heating continuous roller bottom Furnace spheroidizing annealing, steel mesh grade is 1.5~2.5 grade, spheroidization grade is 2.0~3.0 grade; bending degree is not more than 2.5mm / m.

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Abstract

The invention discloses a continuous type alloy steel heat treatment line, solving the problem existing in small-section ultra-long material workpiece heat treatment. The continuous type alloy steel heat treatment line is formed by connecting a continuous type roller hearth heating furnace, a roller hearth type quenching groove and electric heating continuous type roller hearth furnace in series.The heat treatment process comprises the following steps of: carrying out austenitization heating on a workpiece in the continuous type roller hearth heating furnace, rapidly discharging after reaching the process time and then entering into the roller hearth type quenching groove; automatically generating a non-continuous water cold process according to the chemical components and different standards of the workpiece, and rapidly cooling through an immersion or spray mode; and tempering the workpiece which is cooled to room temperature according to the process requirement. The continuous type alloy steel heat treatment line has the advantages that: 1, the quenching, solid solution and normalizing continuous heat treatment of the small-section ultra-long material workpiece are achieved, and the heat treatment is completed on roller beds which are located on the same height and axis; 2, a quenching medium is stable in the rising process, and the workpiece can be simultaneously cooled in the length direction; and 3, fire danger and lamp black pollution are precluded by adopting non-continuous water quenching.

Description

technical field [0001] The invention belongs to alloy steel heat treatment equipment, and specifically relates to a continuous alloy steel heat treatment line, which is suitable for small cross-section ultra-long steel products (diameter or thickness: 20 mm to 155 mm; length: 5.0 m to 8.5 m, the same below.) workpieces Quenching, solid solution, normalizing and tempering (or aging) treatment. Background technique [0002] At present, in addition to the traditional annealing process (spheroidizing annealing and softening annealing) in domestic and foreign metallurgical manufacturing industries, more solid solution + aging treatment, quenching + high temperature tempering and normalizing processes are used to obtain excellent mechanical properties. And steel with uniform microstructure, providing high-performance products for downstream users, including stainless steel solid solution products, mold steel pre-hardened products and high-grade bearing steel products. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/00
Inventor 王琳秋立鹏王维庆黄伟李涛郭强李海军王志华张刚吴国荣肇侠王秀君牟风孙秀华
Owner FUSHUN SPECIAL STEEL SHARES
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