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BS 970 EN30A vs GB/T 3077 12Cr2Ni4A

Minimal Match — 46.6% match based on chemical composition and mechanical property overlap.

BS 970 EN30A (BS 970:1955) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN30A is typically used for used for gears, aircraft components, transmission shafts, heavy-duty pinions, crankshafts, and high-strength fasteners., while GB/T 3077 12Cr2Ni4A is commonly used for used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.. BS 970 EN30A is defined under British Standards (BS), originating from United Kingdom, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, BS 970 EN30A vs GB/T 3077 12Cr2Ni4A is a 70% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 46.6%.

Frequently Compared With BS 970 EN30A:
UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
70%
MECHANICAL MATCH
0%
OVERALL
46.6%
Specifications
Property BS 970 EN30A GB/T 3077 12Cr2Ni4A
Standard BS 970:1955 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.26-0.34 0.10-0.15
Si (%) 0.10-0.35 0.17-0.37
Mn (%) 0.40-0.60 0.30-0.60
Ni (%) 3.90-4.30 3.25-3.75
Cr (%) 1.10-1.40 1.25-1.65
S (%) <=0.050 0.025 max
P (%) <=0.050 0.025 max
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN30A GB/T 3077 12Cr2Ni4A
Tensile Strength ≥1544 MPa (100 tons/sq in, converted) 980-1180 MPa
Yield Strength ≥1313 MPa (85 tons/sq in, converted) 785-980 MPa
Elongation ≥10% 10-14%
Hardness 444 HB 58-62 HRC (case)
Condition Air hardened and tempered (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN30A
Used for gears, aircraft components, transmission shafts, heavy-duty pinions, crankshafts, and high-strength fasteners.
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Can BS 970 EN30A Be Substituted With GB/T 3077 12Cr2Ni4A?
BS 970 EN30A and GB/T 3077 12Cr2Ni4A share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
BS 970 EN30A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6400–6600 mm (251.97–259.84 in)
GB/T 3077 12Cr2Ni4A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6600 mm (196.85–259.84 in)
On M-EX Right Now
BS 970 EN30A
2 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN30A and GB/T 3077 12Cr2Ni4A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN30A be substituted with GB/T 3077 12Cr2Ni4A?
BS 970 EN30A and GB/T 3077 12Cr2Ni4A share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.