What is the IS designation for AISI 304 grade stainless steel?

Grade X04Cr19Ni9, as specified in Table 1.

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)

IS 6911

: 2017

Stainless steel plate, sheet and strip - Specification

CurrentFrequently UsedSpecificationBIMMaterials Science · Roofing Materials

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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.

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

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.