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Keyspark Steel - Tool Steel Supplier
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  • Product
    • Plastic Mold Steel
      • DIN 1.2316
      • 1.2085 | X33CrS16
      • SUS420J2 | 3Cr13 | 420J2 | 1.4028
      • 2Cr13 | 20Cr13
      • 4Cr13 | 40Cr13
      • 1.2083 | 40Х13 | X40Cr14 | 420
      • S136 | 1.2083 | SUS420J2 | 4Cr13 | X40Cr14
      • 1.4034 | 420C | X46Cr13 | S42000 | 4Cr13 | 4H13
      • X20Cr13 | 1.4021 | 420
      • SNCM616V
      • 3Cr17 | 3Cr17+S
      • NAK80 | P21
      • P20 | DIN 1.2311
      • 1.2311 | 40CrMnMo7
      • 1.2312 | 40CrMnMoS8-6
      • 1.2738 | 40CrMnNiMo8-6-4 | P20+Ni
    • Hot Work Steel
      • S7 | 1.2357
      • H11 | 1.2343 | SKD6
      • H12 | 1.2606 | SKD62
      • SKD61 | 1.2344 | H13 Steel | X40CrMoV5-1
      • H13 | DIN 1.2344 | SKD61
      • 1.2344
      • 8407
      • 8418
      • 5H12 | 5Cr5MoWVSi
      • L6 | 55NCDV7 | 5ХНМ | 5CrNiMo
      • SKT4
      • 1.2714 | 56NiCrMoV7
    • Cold Work Steel
      • Cr12MoV
      • SKD11
      • Cr12Mo1V1
      • D2
      • 1.2379
      • K110 | SKD11 | D2 | 1.2379 | X153CrMoV12
      • DC53
      • K340 | DC53 | ASSAB 88 | Cr8Mo2VSi
      • D6 | Cr12W
      • 1.2767 | X45NiCrMo4
      • O1 | 1.2510 | SKS3 | 100MnCrW4
      • SKS3 | STS3 | 9CrWMn
      • 1.2842 | 90MnCrV8 | O2 | SKS31 | 9Mn2V
      • A2 | 1.2363 | SKD12 | X100CrMoV5-1 | T30102
      • Cr12 | D3 | 1.2080 | SKD1
      • D3 | X210Cr12
      • S1 | 1.2550 | 60WCrV8 | 6ХВ2С | SKS41
      • 90MnCrV8
      • A8
      • 1.2358 | 60CrMoV18-5
    • Alloy steel
      • 42CrMo | 1.7225 | 4140
      • 40Cr | 5140
      • 4340 | 40CrNiMo
      • 1.6582
      • 40CrNiMo | 4340
      • 1.7225
      • 4140 | 1.7225
      • Q345 | 16Mn
      • 40Cr | 5140
    • High Speed Steel
      • M4 | 1.3355 | HS6-5-4
      • P18 | W18Cr4V | T1
      • M2 | 1.3343 | SKH51
    • Stainless Steel
      • 420 l | 1.4021 | SUS420J1
      • 17-4PH | 1.4542 | SUS630 | X5CrNiCuNb16-4 | STS630
      • 440C | 1.4125
      • 316 | 1.4401
      • 304 | 1.4301 | 18-8
    • Bearing steel / Wear Resistant Steel
    • Carbon Steel
      • Q235
      • 1045 | C45 | 1.0503
  • Services
    • Steel Test
    • Steel Packing
    • Heat Treatment
    • Cutting
    • Machining
  • Blog
  • Contact us

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Home Posts tagged “4340 Quenching and Tempering”
17 Jun

AISI 4340 Steel Heat Treatment Guide: Annealing, Quenching and Tempering

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Keyspark Steel

Hubei Keyspark Special Steel Co., Ltd. is equipped with 2 sets of 20‑ton EAF furnaces, 2 sets of 20‑ton LF furnaces, 1 set of 20‑ton VD furnace, 1 set of 10‑ton ESR furnace, 1 set of 8‑ton ESR furnace, 2 sets of 5‑ton ESR furnaces, 3 sets of 3‑ton ESR furnaces, 5 sets of 2‑ton ESR furnaces, 5 sets of 1‑ton ESR furnaces, 1 set of 5000‑ton large‑scale press, 1 set of 10‑ton electro‑hydraulic hammer, 1 set of 8‑ton electro‑hydraulic hammer, 1 set of 5‑ton electro‑hydraulic hammer, 2 sets of 3‑ton forging hammers, 2 sets of 1‑ton forging hammers, 12 precision heat‑treatment furnaces, 4 vacuum heat‑treatment furnaces, and more than 20 turning, milling and grinding processing equipment. The company has an annual production capacity of 15000 tons and full‑process processing capabilities. Supported by original mill test certificates and strict quality control systems, our company provides steel material solutions with stable performance and reliable quality for global manufacturing enterprises.

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  • Plastic Mould Steel
  • Hot Work Steel
  • Cold Work Steel
  • Alloy steel
  • Alloy steel
  • Stainless Steel
  • High Speed Steel
  • Plastic Mould Steel
  • Hot Work Steel
  • Cold Work Steel
  • Alloy steel
  • Alloy steel
  • Stainless Steel
  • High Speed Steel

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  • Services
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About Us

  • ADDRESS: Room 1302, Building 2, No. 30 Huahu Avenue, Huangshigang District, Huangshi City, Hubei Province
  • Sales@keysparksteel.com
  • Mobile/Whatsapp: +86 150 2405 6480

Keyspark Steel | © Copyright 2026

  • Home
  • About us
  • Product
    • Plastic Mold Steel
      • DIN 1.2316
      • 1.2085 | X33CrS16
      • SUS420J2 | 3Cr13 | 420J2 | 1.4028
      • 2Cr13 | 20Cr13
      • 4Cr13 | 40Cr13
      • 1.2083 | 40Х13 | X40Cr14 | 420
      • S136 | 1.2083 | SUS420J2 | 4Cr13 | X40Cr14
      • 1.4034 | 420C | X46Cr13 | S42000 | 4Cr13 | 4H13
      • X20Cr13 | 1.4021 | 420
      • SNCM616V
      • 3Cr17 | 3Cr17+S
      • NAK80 | P21
      • P20 | DIN 1.2311
      • 1.2311 | 40CrMnMo7
      • 1.2312 | 40CrMnMoS8-6
      • 1.2738 | 40CrMnNiMo8-6-4 | P20+Ni
    • Hot Work Steel
      • S7 | 1.2357
      • H11 | 1.2343 | SKD6
      • H12 | 1.2606 | SKD62
      • SKD61 | 1.2344 | H13 Steel | X40CrMoV5-1
      • H13 | DIN 1.2344 | SKD61
      • 1.2344
      • 8407
      • 8418
      • 5H12 | 5Cr5MoWVSi
      • L6 | 55NCDV7 | 5ХНМ | 5CrNiMo
      • SKT4
      • 1.2714 | 56NiCrMoV7
    • Cold Work Steel
      • Cr12MoV
      • SKD11
      • Cr12Mo1V1
      • D2
      • 1.2379
      • K110 | SKD11 | D2 | 1.2379 | X153CrMoV12
      • DC53
      • K340 | DC53 | ASSAB 88 | Cr8Mo2VSi
      • D6 | Cr12W
      • 1.2767 | X45NiCrMo4
      • O1 | 1.2510 | SKS3 | 100MnCrW4
      • SKS3 | STS3 | 9CrWMn
      • 1.2842 | 90MnCrV8 | O2 | SKS31 | 9Mn2V
      • A2 | 1.2363 | SKD12 | X100CrMoV5-1 | T30102
      • Cr12 | D3 | 1.2080 | SKD1
      • D3 | X210Cr12
      • S1 | 1.2550 | 60WCrV8 | 6ХВ2С | SKS41
      • 90MnCrV8
      • A8
      • 1.2358 | 60CrMoV18-5
    • Alloy steel
      • 42CrMo | 1.7225 | 4140
      • 40Cr | 5140
      • 4340 | 40CrNiMo
      • 1.6582
      • 40CrNiMo | 4340
      • 1.7225
      • 4140 | 1.7225
      • Q345 | 16Mn
      • 40Cr | 5140
    • High Speed Steel
      • M4 | 1.3355 | HS6-5-4
      • P18 | W18Cr4V | T1
      • M2 | 1.3343 | SKH51
    • Stainless Steel
      • 420 l | 1.4021 | SUS420J1
      • 17-4PH | 1.4542 | SUS630 | X5CrNiCuNb16-4 | STS630
      • 440C | 1.4125
      • 316 | 1.4401
      • 304 | 1.4301 | 18-8
    • Bearing steel / Wear Resistant Steel
    • Carbon Steel
      • Q235
      • 1045 | C45 | 1.0503
  • Services
    • Steel Test
    • Steel Packing
    • Heat Treatment
    • Cutting
    • Machining
  • Blog
  • Contact us
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Contact Information

  • ADDRESS: Room 1302, Building 2, No. 30 Huahu Avenue, Huangshigang District, Huangshi City, Hubei Province
  • Sales@keysparksteel.com
  • Mobile/Whatsapp: +86 150 2405 6480

Keyspark Steel specializes in mold steel, alloy steel, and high-speed steel — providing reliable solutions for customers around the world.

Please kindly send the inquiry to our team and we’ll get in touch shortly!