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Structural Steel Subjected to End-Quench Hardenability Requirements

Overview

Structural steel subjected to end-quench hardenability requirements are high-strength structural steels designed to have consistent and reliable hardenability. These steels undergo precise control of their chemical composition and heat treatment processes to ensure they meet specific hardenability criteria during the end-quench test. They are commonly used in applications requiring high strength and wear resistance, such as in the automotive, construction machinery, and heavy equipment manufacturing industries.

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Characteristics

  • Consistent Hardenability: These steels demonstrate consistent hardening depth and hardness distribution in end-quench tests, ensuring reliable performance in applications.
  • High Strength and Wear Resistance: When properly heat-treated, these steels exhibit excellent strength and wear resistance, making them suitable for high-load and high-wear environments.
  • Good Toughness: In addition to high strength and hardness, these steels possess good toughness, enabling them to resist impact and fracture.

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Production Process

  • Chemical Composition Control: Strict control of the steel’s chemical composition, particularly the levels of carbon, manganese, chromium, nickel, and other alloying elements, ensures its hardenability.
  • Heat Treatment:Precise heat treatment processes, including austenitizing, quenching, and tempering, are employed to achieve the desired hardening depth and hardness distribution.
  • End-Quench Testing: The steel undergoes end-quench testing to measure its hardening depth and hardness distribution, verifying its compliance with hardenability requirements.

Applications

  • Automotive Industry:Used to manufacture high-strength and wear-resistant automotive components such as axles, gears, and crankshafts. For instance, axles made from this steel can withstand high loads and wear conditions, ensuring durability and reliability in vehicles.
  • Construction Machinery:Ideal for producing critical components of heavy machinery, such as excavator arms, bulldozer blades, and crane booms. Excavator arms fabricated from this steel offer superior wear resistance and high strength, essential for demanding construction tasks.
  • Heavy Equipment Manufacturing:Suitable for producing high-load parts in heavy equipment, such as bearings and transmission components in compressors and pumps. These parts require high strength and longevity, which this steel type provides.

Common Sizes

  • Sheet and Plate:

Thickness: 0.5mm – 200mm

Width: 600mm – 2500mm

Length: 2000mm – 12000mm

  • Bar:

Diameter: ฯ†16-190mm

Length 4-12m

Chemical Composition

Structural Steel Subjected to End-Quench Hardenability Requirements
NO. Grade Chemical Composition (Mass Fraction) /%
C Si Mn Cr Ni Mo B Ti V
1 45H 0.42๏ฝž0.50 0.17๏ฝž0.37 0.50๏ฝž0.85
2 15CrH 0.12๏ฝž0.18 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25
3 20CrH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.50๏ฝž0.85 0.70๏ฝž1.10
4 20CrlH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25
5 40CrH 0.37๏ฝž0.44 0.17๏ฝž0.37 0.50๏ฝž0.85 0.70๏ฝž1.10
6 45CrH 0.42๏ฝž0.49 0.17๏ฝž0.37 0.50๏ฝž0.85 0.70๏ฝž1.10
7 16CrMnH 0.14๏ฝž0.19 0.37 1.00๏ฝž1.30 0.80๏ฝž1.10
8 20CrMnH 0.17๏ฝž0.22 โ‰ค0.37 1.10๏ฝž1.40 1.00๏ฝž1.30
9 15CrMnBH 0.13๏ฝž0.18 0.17๏ฝž0.37 1.00๏ฝž1.30 0.80๏ฝž1.10 0.0005๏ฝž0.0030
10 17CrMnBH 0.15๏ฝž0.20 0.17๏ฝž0.37 1.00๏ฝž1.30 1.00๏ฝž1.30 0.0005๏ฝž0.0030
11 40MnBH 0.37๏ฝž0.44 0.17๏ฝž0.37 1.00๏ฝž1.40 0.0005๏ฝž0.0035
12 45MnBH 0.42๏ฝž0.49 0.17๏ฝž0.37 1.00๏ฝž1.40 0.0005๏ฝž0.0035
13 20MnVBH 0.17๏ฝž0.23 0.17๏ฝž0.37 1.05๏ฝž1.45 0.0005๏ฝž0.0035 0.07๏ฝž0.12
14 20MnTiBH 0.17๏ฝž0.23 0.17๏ฝž0.37 1.20๏ฝž1.55 0.0005๏ฝž0.0035 0.04๏ฝž0.10
15 15CrMoH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25 0.15๏ฝž0.25
16 20CrMoH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25 0.15๏ฝž0.25
17 22CrMoH 0.19๏ฝž0.25 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25 0.35๏ฝž0.45
18 42CrMoH 0.37๏ฝž0.44 0.17๏ฝž0.37 0.55๏ฝž0.90 0.85๏ฝž1.25 0.15๏ฝž0.25
19 20CrMnMoH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.85๏ฝž1.20 1.05๏ฝž1.40 0.20๏ฝž0.30
20 20CrMnTiH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.80~1.15 1.00๏ฝž1.35 0.04๏ฝž0.10
21 20CrNi3H 0.17๏ฝž0.23 0.17๏ฝž0.37 0.30๏ฝž0.65 0.60๏ฝž0.95 2.70๏ฝž3.25
22 12Cr2Ni4H 0.10๏ฝž0.17 0.17๏ฝž0.37 0.30๏ฝž0.65 1.20๏ฝž1.75 3.20๏ฝž3.75
23 20CrNiMoH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.60~0.95 0.35~0.65 0.35๏ฝž0.75 0.15๏ฝž0.25
24 20CrNi2MoH 0.17๏ฝž0.23 0.17๏ฝž0.37 0.40๏ฝž0.70 0.35๏ฝž0.65 1.55๏ฝž2.00 0.20๏ฝž0.30

Comparison Table of Steel Grades by Country

Structural Steel Subjected to End-Quench Hardenability Requirements
NO. GB SAE DIN JIS
1 15CrH SCr415H
2 20CrlH SCr420H
3 16CrMnH 16MnCr5
4 20CrMnH 20MnCr5
5 15CrMnBH
6 17CrMnBH
7 15CrMoH SCM415H
8 20CrMoH SCM420H
9 22CrMoH SCM822H
10 42CrMoH SCM440H
11 20CrNi2MoH SAE4320