IS 6603:2024 X07Cr17Ni7Al Steel: Specifications & Listings

IS 6603:2024 X07Cr17Ni7Al: X07Cr17Ni7Al: precipitation hardening corrosion resisting stainless steel. Specified in IS 6603:2024.

Category: Stainless Steel
Grade Details
GradeIS 6603:2024 X07Cr17Ni7Al
Standard IS 6603:2024
ApplicationsGeneral purposes, semi-finished products, bars, wire rods and bright bars
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 631 ASTM A959:2011 USA No activity yet
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X7CrNiAl17-7 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2014 Strong Match
EN 10088-1 X7CrNiAl17-7 EN 10088-1:2023 Strong Match
EN 10088-3 X7CrNiAl17-7 EN 10088-3:2014 Strong Match
ASTM A959 631 ASTM A959:2011 Strong Match
EN 10088-1 X5CrNi17-7 EN 10088-1:2014 Close Alternative
ASTM A959 301 ASTM A959:2011 Close Alternative
ASTM A959 635 ASTM A959:2011 Close Alternative
BS 970 (Part 3) 304S31 BS 970 (Part 3):1991 Close Alternative
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Si Mn P S Cr Ni Al
<=0.09 <=0.70 <=1.00 <=0.040 <=0.015 16.0-18.0 6.5-7.8 0.70-1.50
Mechanical Properties
Tensile Strength <=850 MPa
Hardness <=255 HB
Condition Solution annealed (+AT), conditions 1C, 1E, 1D, 1X, 1G and 2D; hardness as printed

More data from IS 6603:2024

From the standard
Mechanical properties by heat treatment condition 1 conditions
ConditionHardness HBRp0.2 min (MPa)Rm min (MPa)Rm max (MPa)A min (%)KV2 min (J)
+AT255--850--
+AT = solution annealed, +P = precipitation hardened.
Source: IS 6603:2024, Table 9
Hot forming and solution annealing guideline temperatures
Hot forming temperature
1150 to 900 deg C
Cooling after hot forming
air
Heat treatment symbol
+AT
Solution annealing temperature
1020 to 1080 deg C
Cooling after solution annealing
water, air
Informative guideline (Annex A).
Source: IS 6603:2024, Table 24

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