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IS 6911:2017 is the Indian Standard (BIS) for stainless steel plate, sheet and strip - specification. This standard specifies the requirements for hot-rolled and cold-rolled stainless steel plates, sheets, and strips for general purposes. It outlines various grades, their chemical composition, mechanical properties, dimensional tolerances, finish types, and testing procedures.
Specifies requirements for stainless steel plate, sheet, and strip for various applications, including roofing and cladding.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The designation system (e.g., X04Cr19Ni9) is based on chemical composition. It's crucial to correctly map these to common commercial grades like 304, 316, etc. using Table 1.
! The specified surface finish (e.g., 2B, No. 4, BA) is defined in Clause 12 and Table 12, and is critical for the final product's appearance and performance.
! Always verify dimensional tolerances for thickness, width, and flatness from Tables 4 to 11, as they are crucial for precision fabrication and assembly.
Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
Covers chemical and mechanical requirements for a wide range of stainless steel flat-rolled products for general use.
EN 10088-2:2023CEN (European Committee for Standardization), Europe
HighCurrent
Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
Specifies technical delivery conditions for hot or cold rolled stainless steel sheet, plate, and strip for general purposes.
JIS G 4304:2021 & JIS G 4305:2021JSA (Japanese Standards Association), Japan
HighCurrent
Hot-rolled stainless steel plates, sheets and strip & Cold-rolled stainless steel plates, sheets and strip
These two standards collectively cover the requirements for hot-rolled and cold-rolled stainless steel flat products.
ISO 16143-2:2014ISO (International Organization for Standardization), International
MediumCurrent
Stainless steels for general purposes — Part 2: Corrosion-resisting sheet and strip
Specifies requirements for corrosion-resisting stainless steel sheet and strip, but is less comprehensive in grade variety than IS 6911.
Key Differences
≠IS 6911 includes approximately 68 grades, whereas standards like ASTM A240/A240M cover a much larger variety, including many specialized duplex, super-austenitic, and precipitation-hardening grades.
≠Finish designation systems differ. While IS 6911 uses designations (e.g., No.1, 2B, No.4) largely aligned with ASTM, EN 10088-2 uses a different alphanumeric system (e.g., 1D, 2B, 2J).
≠While many chemical composition ranges are harmonized, some grades have subtle but important differences. For example, the Molybdenum range for Grade 316L in ASTM A240 (2.00-3.00%) is wider than in IS 6911 (2.00-2.50%).
≠Dimensional and form tolerances are specified within IS 6911 (or by reference to other IS codes like IS 11599), which may not be identical to the tolerances specified in ASTM A480/A480M or the EN ISO 9444/9445 series.
Key Similarities
≈The chemical compositions and mechanical properties for the most common austenitic (304, 316L) and ferritic (430) grades are very closely aligned or identical across IS 6911, ASTM A240, and EN 10088-2.
≈All standards cover the same primary product forms: hot and cold rolled plate, sheet, and strip, intended for general engineering and structural applications.
≈IS 6911 adopts the Unified Numbering System (UNS) for grade designation, similar to ASTM, which provides a harmonized method for identifying specific alloy compositions internationally.
≈The fundamental requirements for quality control, such as performing tensile tests (yield, tensile, elongation) and chemical analysis for product acceptance, are a common basis for all the standards.
Parameter Comparison
Parameter
IS Value
International
Source
Molybdenum (%) for Grade 316L (X02Cr17Ni12Mo2)
2.00 - 2.50
2.00 - 3.00
ASTM A240/A240M (S31603)
Nitrogen (%) for Grade 304L (X02Cr19Ni10)
0.10 max
0.12 max
EN 10088-2:2023 (1.4307)
Yield Strength, min (MPa) for Grade 304 (X04Cr19Ni10)
205
210
EN 10088-2:2023 (1.4301)
Tensile Strength, min (MPa) for Grade 304 (X04Cr19Ni10)
515
515
ASTM A240/A240M (S30400)
Finish designation for bright annealed
BA
2R
EN 10088-2:2023
Finish designation for dull polished
No. 4
2J
EN 10088-2:2023
Elongation, min (%) for Grade 304 (annealed, thickness ≥ 3mm)
40 (on gauge length L₀ = 5.65√S₀)
40 (on gauge length of 2 in. or 50 mm)
ASTM A240/A240M (S30400)
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Max Carbon content for Grade X04Cr19Ni9 (304)0.08 %
Min 0.2% Proof Stress for Grade X04Cr19Ni9 (304)205 MPa
Min Tensile Strength for Grade X04Cr19Ni9 (304)515 MPa
Min Elongation for Grade X04Cr19Ni9 (304)40 %
Max Carbon content for Grade X02Cr19Ni10 (304L)0.030 %
Min 0.2% Proof Stress for Grade X02Cr17Ni12Mo2 (316L)205 MPa
Standard thickness tolerance for 2mm cold-rolled sheet (width 600-1250mm)±0.18 mm
Tables & Referenced Sections
Key Tables
Table 1 - Chemical Composition of Stainless Steels
Table 2 - Mechanical Properties of Stainless Steels at Room Temperature
Table 4 - Tolerances on Thickness of Hot-Rolled Plates, Sheets and Strips
Table 7 - Tolerances on Thickness of Cold-Rolled Sheets and Strips
What is the IS designation for AISI 304 grade stainless steel?+
Grade X04Cr19Ni9, as specified in Table 1.
What is the minimum 0.2% proof stress for Grade X04Cr19Ni9 (304)?+
205 MPa, according to Table 2.
What is the difference between Grade X04Cr19Ni9 (304) and X02Cr19Ni10 (304L)?+
Grade 304L (X02Cr19Ni10) has a lower maximum carbon content (0.030%) compared to 304 (0.08%), which improves its resistance to intergranular corrosion after welding. (Table 1)
What is a '2B' finish?+
It is a smooth, moderately reflective cold-rolled finish typically produced by annealing and pickling, followed by a light pass on polished rolls. It is the most common finish for unpolished applications. (Clause 12.2.2)