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GB/T 1591 Q355C vs IS 11169 (Part 1) 20Mn5Cr5

Related Material — 65% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q355C (GB/T 1591:2018) and IS 11169 (Part 1) 20Mn5Cr5 (IS 11169 (Part 1):2022) are both steel grades. GB/T 1591 Q355C is classified under Structural Steel, while IS 11169 (Part 1) 20Mn5Cr5 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 1591 Q355C is typically used for general structure for engineering (plates, strips, bars and sections), while IS 11169 (Part 1) 20Mn5Cr5 is commonly used for cold heading and cold extrusion of parts that are case hardened; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, annex b). GB/T 1591 Q355C is defined under Guobiao Standards (GB/T), originating from China, while IS 11169 (Part 1) 20Mn5Cr5 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, GB/T 1591 Q355C vs IS 11169 (Part 1) 20Mn5Cr5 is a 67.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

Frequently Compared With GB/T 1591 Q355C:
GOST 19281 09G2S AS/NZS 3679.1 300 AS/NZS 3679.1 350 CSA G40.21 400A CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 50
Other Structural Steel Grades to Compare With GB/T 1591 Q355C:
CSA G40.21 260W CSA G40.21 300W CSA G40.21 350W ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
67.6%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 1591 Q355C IS 11169 (Part 1) 20Mn5Cr5
Standard GB/T 1591:2018 IS 11169 (Part 1):2022
Category Structural Steel Alloy Steel
C (%) <=0.20 0.17-0.22
Si (%) <=0.55 0.10-0.35
Mn (%) <=1.60 1.00-1.40
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.035
Cr (%) <=0.30 1.00-1.30
Ni (%) <=0.30 <=0.15
Cu (%) <=0.40 <=0.15
N (%) <=0.012 Not specified
Mo (%) Not specified <=0.05
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 1591 Q355C IS 11169 (Part 1) 20Mn5Cr5
Tensile Strength 470-630 MPa Not specified
Yield Strength >=355 MPa Not specified
Elongation >=22% Not specified
Condition Hot-rolled (as-rolled), nominal thickness or diameter up to 16 mm for yield; tensile strength for up to 100 mm; elongation longitudinal, up to 40 mm Not specified
Hardness, annealed (+AC) Not specified <=170 HBW
Typical Applications
GB/T 1591 Q355C
General structure for engineering (plates, strips, bars and sections)
IS 11169 (Part 1) 20Mn5Cr5
Cold heading and cold extrusion of parts that are case hardened; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, Annex B)
Key Differences
Can GB/T 1591 Q355C Be Substituted With IS 11169 (Part 1) 20Mn5Cr5?
GB/T 1591 Q355C and IS 11169 (Part 1) 20Mn5Cr5 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.
On M-EX Right Now
GB/T 1591 Q355C
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IS 11169 (Part 1) 20Mn5Cr5
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Frequently Asked Questions
What is the difference between GB/T 1591 Q355C and IS 11169 (Part 1) 20Mn5Cr5?
Different category: GB/T 1591 Q355C is Structural Steel, IS 11169 (Part 1) 20Mn5Cr5 is Alloy Steel. GB/T 1591 Q355C specifies N which is not specified for IS 11169 (Part 1) 20Mn5Cr5. IS 11169 (Part 1) 20Mn5Cr5 specifies Mo which is not specified for GB/T 1591 Q355C.
Can GB/T 1591 Q355C be substituted with IS 11169 (Part 1) 20Mn5Cr5?
GB/T 1591 Q355C and IS 11169 (Part 1) 20Mn5Cr5 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.