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IS 6603:2024 X05Cr16Ni4CuNb Steel: Specifications & Listings

IS 6603:2024 X05Cr16Ni4CuNb: X05Cr16Ni4CuNb: precipitation hardening corrosion resisting stainless steel, numerical symbol 630. Specified in IS 6603:2024.

Category: Stainless Steel
Grade Details
GradeIS 6603:2024 X05Cr16Ni4CuNb
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
EN 10088-1 X5CrNiCuNb16-4 EN 10088-1:2014 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
EN 10088-1 X5CrNiCuNb16-4 EN 10088-1:2014 Strong Match
EN 10088-1 X5CrNiCuNb16-4 EN 10088-1:2023 Strong Match
EN 10088-3 X5CrNiCuNb16-4 EN 10088-3:2014 Close Alternative
EN 10088-1 X4CrNiMo16-5-1 EN 10088-1:2014 Close Alternative
EN 10088-1 X4CrNiMo16-5-1 EN 10088-1:2023 Close Alternative
ASTM A959 329 ASTM A959:2011 Related Material
EN 10088-1 X5CrNiMoCuNb14-5 EN 10088-1:2014 Related Material
EN 10088-1 X5CrNiMoCuNb14-5 EN 10088-1:2023 Related Material
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 Mo Ni Cu Nb
<=0.07 <=0.70 <=1.50 <=0.040 <=0.030 15.0-17.0 <=0.60 3.0-5.0 3.0-5.0 <=0.45
Mechanical Properties
Tensile Strength <=1200 MPa
Hardness <=363 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 5 conditions
ConditionHardness HBRp0.2 min (MPa)Rm min (MPa)Rm max (MPa)A min (%)KV2 min (J)
+AT363--1200--
+P1-5208009501875
+P2-72093011001640
+P3-790960116012-
+P4-10001070127010-
+AT = solution annealed, +P = precipitation hardened.
Source: IS 6603:2024, Table 9
Bright bars, annealed and precipitation hardened 8 rows
Thickness or diameter (mm)Annealed Rm max (MPa)Annealed HB max (information)ConditionRp0.2 min (MPa)Rm (MPa)A5 min (%)KV2 min, longitudinal (J)
up to 101200360+P1600900 to 110010-
over 10 to 161200360+P1600900 to 110010-
over 16 to 401200360+P1520800 to 10501275
over 40 to 631200360+P1520800 to 10001875
over 63 to 1601200360+P1520800 to 9501875
up to 100--+P2720930 to 11001240
up to 100--+P3790960 to 116010-
up to 100--+P410001070 to 127010-
Bright bars, conditions 2H, 2B, 2G or 2P.
Source: IS 6603:2024, Table 19
Proof strength at elevated temperature 5 temperatures
Temperature (deg C)Rp0.2 min, +P1 (MPa)Rp0.2 min, +P2 (MPa)Rp0.2 min, +P3 (MPa)
100680730880
150660710830
200640690800
250620670770
300600650750
Minimum values, precipitation hardened; for guidance only.
Source: IS 6603:2024, Table 14
Hot forming and heat treatment 5 conditions
ConditionSolution annealing temperature (deg C)Cooling after solution annealingPrecipitation hardening (deg C)
+AT1020 to 1060--
+P11020 to 1060rapid cooling610 to 630, air
+P21020 to 1060rapid cooling570 to 590, air
+P31020 to 1060rapid cooling540 to 560, air
+P41020 to 1060rapid cooling470 to 490, air
Hot forming 1150 to 900 deg C, cooling: furnace, air. Informative guideline (Annex A).
Source: IS 6603:2024, Table 24

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