Close Alternative — 77.8% match
based on chemical composition and mechanical property overlap.
GB/T 699 25 (GB/T 699:2015) and IS 11169 (Part 1) 40C8 (IS 11169 (Part 1):2022) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 25 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while IS 11169 (Part 1) 40C8 is commonly used for cold heading and cold extrusion of parts that are quenched and tempered; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, annex c).
GB/T 699 25 is defined under Guobiao Standards (GB/T), originating from China, while IS 11169 (Part 1) 40C8 is defined under Bureau of Indian Standards (IS), originating from India.
As per chemical composition, GB/T 699 25 vs IS 11169 (Part 1) 40C8 is a 77.8% 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 77.8%.
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 699 25
IS 11169 (Part 1) 40C8
Tensile Strength
>=450 MPa
Not specified
Yield Strength
>=275 MPa
Not specified
Elongation
>=23%
Not specified
Condition
Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Not specified
Core Hardness (CH)
Not specified
>=40 HRC up to 11 mm
Hardness, annealed (+AC)
Not specified
<=170 HBW
Typical Applications
GB/T 699 25
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
IS 11169 (Part 1) 40C8
Cold heading and cold extrusion of parts that are quenched and tempered; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, Annex C)
Key Differences
IS 11169 (Part 1) 40C8 specifies Mo which is not specified for GB/T 699 25.
Can GB/T 699 25 Be Substituted With IS 11169 (Part 1) 40C8?
GB/T 699 25 and IS 11169 (Part 1) 40C8 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.
What is the difference between GB/T 699 25 and IS 11169 (Part 1) 40C8?
IS 11169 (Part 1) 40C8 specifies Mo which is not specified for GB/T 699 25.
Can GB/T 699 25 be substituted with IS 11169 (Part 1) 40C8?
GB/T 699 25 and IS 11169 (Part 1) 40C8 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.