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IS 1570 (Part 7) 18C10H vs BS 970 EN21A

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

IS 1570 (Part 7) 18C10H (IS 1570 (Part 7):1992) and BS 970 EN21A (BS 970:1955) are both steel grades. IS 1570 (Part 7) 18C10H is classified under Carbon Steel, while BS 970 EN21A is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. IS 1570 (Part 7) 18C10H is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 EN21A is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 7) 18C10H vs BS 970 EN21A is a 75.3% 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 IS 1570 (Part 7) 18C10H:
BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A62 BS 970 (Part 1) 060A67 BS 970 (Part 1) 060A72 BS 970 (Part 1) 060A78
Match Breakdown
CHEMISTRY MATCH
75.3%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property IS 1570 (Part 7) 18C10H BS 970 EN21A
Standard IS 1570 (Part 7):1992 BS 970:1955
Category Carbon Steel Alloy Steel
C (%) 0.15-0.22 0.20-0.30
Si (%) 0.10-0.35 0.10-0.35
Mn (%) 0.60-1.40 <=0.60
P (%) <=0.045 <=0.050
S (%) <=0.045 <=0.050
Ni (%) <=0.35 2.50-3.50
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 IS 1570 (Part 7) 18C10H BS 970 EN21A
Tensile Strength 460-580 MPa Not specified
Yield Strength >=265 MPa (0.2 % proof stress) Not specified
Elongation >=22% Not specified
Condition Seamless pipe and pipe with seam, HF, N, thickness - (first row of Table 3) Not specified
Typical Applications
IS 1570 (Part 7) 18C10H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
BS 970 EN21A
Not documented
Key Differences
Can IS 1570 (Part 7) 18C10H Be Substituted With BS 970 EN21A?
IS 1570 (Part 7) 18C10H and BS 970 EN21A 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.
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IS 1570 (Part 7) 18C10H
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BS 970 EN21A
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Frequently Asked Questions
What is the difference between IS 1570 (Part 7) 18C10H and BS 970 EN21A?
Different category: IS 1570 (Part 7) 18C10H is Carbon Steel, BS 970 EN21A is Alloy Steel. IS 1570 (Part 7) 18C10H specifies Cu which is not specified for BS 970 EN21A.
Can IS 1570 (Part 7) 18C10H be substituted with BS 970 EN21A?
IS 1570 (Part 7) 18C10H and BS 970 EN21A 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.