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GB/T 3077 20CrNiMo vs BS 970 (Part 1) 805H20

Close Alternative — 82.6% match based on chemical composition and mechanical property overlap.

GB/T 3077 20CrNiMo (GB/T 3077:2015) and BS 970 (Part 1) 805H20 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 20CrNiMo is typically used for used for carburized gears, shafts, heavy-duty pinions, gearbox components, couplings, and bearings., while BS 970 (Part 1) 805H20 is commonly used for case hardening steel supplied to specified hardenability limits (end quench test, table 10).. GB/T 3077 20CrNiMo is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 805H20 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 20CrNiMo vs BS 970 (Part 1) 805H20 is a 82.6% 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 82.6%.

Frequently Compared With GB/T 3077 20CrNiMo:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
82.6%
MECHANICAL MATCH
No shared data
OVERALL
82.6%
Specifications
Property GB/T 3077 20CrNiMo BS 970 (Part 1) 805H20
Standard GB/T 3077:2015 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.17-0.23 0.17-0.23
Si (%) 0.17-0.37 Not specified
Mn (%) 0.60-0.95 0.60-0.95
Cr (%) 0.40-0.70 0.35-0.65
Mo (%) 0.20-0.30 0.15-0.25
Ni (%) 0.35-0.75 0.35-0.75
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 20CrNiMo BS 970 (Part 1) 805H20
Tensile Strength >=980 MPa Not specified
Yield Strength >=785 MPa Not specified
Elongation >=9% 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 20CrNiMo
Used for carburized gears, shafts, heavy-duty pinions, gearbox components, couplings, and bearings.
BS 970 (Part 1) 805H20
Case hardening steel supplied to specified hardenability limits (end quench test, Table 10).
Key Differences
Can GB/T 3077 20CrNiMo Be Substituted With BS 970 (Part 1) 805H20?
GB/T 3077 20CrNiMo and BS 970 (Part 1) 805H20 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 20CrNiMo
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–7000 mm (181.1–275.59 in)
BS 970 (Part 1) 805H20
No active listings currently.
On M-EX Right Now
GB/T 3077 20CrNiMo
2 active listings and RFQs →
BS 970 (Part 1) 805H20
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 20CrNiMo and BS 970 (Part 1) 805H20?
GB/T 3077 20CrNiMo specifies Si, Cu which are not specified for BS 970 (Part 1) 805H20.
Can GB/T 3077 20CrNiMo be substituted with BS 970 (Part 1) 805H20?
GB/T 3077 20CrNiMo and BS 970 (Part 1) 805H20 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.