Post Stock Login Register

IS 1570 (Part 4) 40Cr4 vs GB/T 3077 12Cr2Ni4A

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 40Cr4 (IS 1570 (Part 4):1988) and GB/T 3077 12Cr2Ni4A (GB/T 3077-2015) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 40Cr4 is defined under Bureau of Indian Standards (IS), originating from India, while GB/T 3077 12Cr2Ni4A is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, IS 1570 (Part 4) 40Cr4 vs GB/T 3077 12Cr2Ni4A is a 63.8% match. As per mechanical properties, the match is 5.2%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With IS 1570 (Part 4) 40Cr4:
IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 GOST 4543 12HN3A IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
63.8%
MECHANICAL MATCH
5.2%
OVERALL
35%
Specifications
Property IS 1570 (Part 4) 40Cr4 GB/T 3077 12Cr2Ni4A
Standard IS 1570 (Part 4):1988 GB/T 3077-2015
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.10-0.15
Si (%) 0.10-0.35 0.17-0.37
Mn (%) 0.60-0.90 0.30-0.60
Cr (%) 0.90-1.20 1.25-1.65
Ni (%) Not specified 3.25-3.75
P (%) Not specified 0.025 max
S (%) Not specified 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 IS 1570 (Part 4) 40Cr4 GB/T 3077 12Cr2Ni4A
Tensile Strength 890-1040 MPa 980-1180 MPa
Yield Strength >=650 MPa (0.2 % proof stress) 785-980 MPa
Elongation >=11% 10-14%
Izod Impact >=50 J Not specified
Hardness 255-311 HBS (guidance only) 58-62 HRC (case)
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm Not specified
Typical Applications
IS 1570 (Part 4) 40Cr4
Not documented
GB/T 3077 12Cr2Ni4A
Used for gears, shafts, pinions, aircraft parts, heavy-duty bearings, and transmission components.
Key Differences
Can IS 1570 (Part 4) 40Cr4 Be Substituted With GB/T 3077 12Cr2Ni4A?
IS 1570 (Part 4) 40Cr4 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
IS 1570 (Part 4) 40Cr4
No active listings currently.
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
IS 1570 (Part 4) 40Cr4
0 active listings and RFQs →
GB/T 3077 12Cr2Ni4A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 40Cr4 and GB/T 3077 12Cr2Ni4A?
GB/T 3077 12Cr2Ni4A specifies Ni, P, S which are not specified for IS 1570 (Part 4) 40Cr4.
Can IS 1570 (Part 4) 40Cr4 be substituted with GB/T 3077 12Cr2Ni4A?
IS 1570 (Part 4) 40Cr4 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.