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GB/T 3077 20CrMo vs BS 970 (Part 1) 708M20

Close Alternative — 82.5% match based on chemical composition and mechanical property overlap.

GB/T 3077 20CrMo (GB/T 3077:2015) and BS 970 (Part 1) 708M20 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 20CrMo is typically used for used for gears, shafts, axles, transmission parts, fasteners, and machine components., while BS 970 (Part 1) 708M20 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. GB/T 3077 20CrMo is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 708M20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 20CrMo vs BS 970 (Part 1) 708M20 is a 82.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 82.5%.

Frequently Compared With GB/T 3077 20CrMo:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A NF A35-565 100C6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
82.5%
MECHANICAL MATCH
No shared data
OVERALL
82.5%
Specifications
Property GB/T 3077 20CrMo BS 970 (Part 1) 708M20
Standard GB/T 3077:2015 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.17-0.24 0.17-0.23
Si (%) 0.17-0.37 Not specified
Mn (%) 0.40-0.70 0.60-0.90
Cr (%) 0.80-1.10 0.85-1.15
Mo (%) 0.15-0.25 0.15-0.25
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.040
Cu (%) <=0.30 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 3077 20CrMo BS 970 (Part 1) 708M20
Tensile Strength >=885 MPa Not specified
Yield Strength >=685 MPa Not specified
Elongation >=12% Not specified
Hardness <=197 HB Not specified
Condition Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 20CrMo
Used for gears, shafts, axles, transmission parts, fasteners, and machine components.
BS 970 (Part 1) 708M20
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can GB/T 3077 20CrMo Be Substituted With BS 970 (Part 1) 708M20?
GB/T 3077 20CrMo and BS 970 (Part 1) 708M20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
GB/T 3077 20CrMo
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4800–5200 mm (188.98–204.72 in)
BS 970 (Part 1) 708M20
No active listings currently.
On M-EX Right Now
GB/T 3077 20CrMo
2 active listings and RFQs →
BS 970 (Part 1) 708M20
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 20CrMo and BS 970 (Part 1) 708M20?
GB/T 3077 20CrMo specifies Si, Cu which are not specified for BS 970 (Part 1) 708M20.
Can GB/T 3077 20CrMo be substituted with BS 970 (Part 1) 708M20?
GB/T 3077 20CrMo and BS 970 (Part 1) 708M20 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.