Crafted with Precision
At Raajratna Stainless Pvt. Ltd., precision drives our production through advanced in-house processes:
01
Precision Welding
Automatic GTA welding ensures exceptional quality, strength, and durability.
02
Bright Annealing process
Our Bright Annealing process guarantees unmatched smoothness and ductility with high-purity hydrogen gas treatment.
03
Mechanical Polish
Mechanical polishing process yields uniform surfaces, enhancing integrity and ease of cleaning.
04
Electro-Polishing
Electro-Polishing achieves mirror-like finishes, significantly reducing surface roughness for premium applications.
05
Lasting Protection
Passivation treatment creates a robust chromium oxide layer, significantly improving corrosion resistance.
| Grade | Standard |
| TP 304 / 304L / 316 / 316L / 316Lcs / 1.4301 / 1.4307 / 1.4401 / 1.4404 | ASTM A270 / EN 10217-7 / BS 4825-1 / ISO 2037 / SMS 3008 |
| 316Lcs / 1.4404 / 1.4435 | ASTM A270 S2 / ASME-BPE* / EN 10217-7 |
| TP304 / 304L / 316 / 316L / 316Lcs / 1.4307 / 1.4404 / 904L / 1.4539 and duplex material | ASTM A249 / ASTM A269 / ASTM A270 / ASTM A688 / ASTM A789 / A790 |
| Grade 1 / Grade 2 | ASTM B 338 |
Product Range
| OD mm | WT mm/inch | Length mm/feet | |||
| Min. | 12.7 | 0.5 | 0.02″ | 6000 | 20 |
| Max. | 101.6 | 4.0 | 0.15″ | 12000 | 40 |
Product Finish Specification
| Process Designation | Equivalent to | Surface Treatment | Inside Surface Finish Value (Ra) | ||
| Outer Surface | Inner Surface | μ-ln (max) | μ-m (max) | ||
| BA – BA | SF0 | Bright Annealed | Bright Annealed | – | – |
| MP – BA | SF3 | Mechanical Polished | Bright Annealed | 30 | ≤ 0.76 |
| MP – MP | SF2 | Mechanical Polished | Mechanical Polished | 25 | ≤ 0.64 |
| SF1 | 20 | ≤ 0.51 | |||
| MP – EP | SF4 | Mechanical Polished | Electro Polished | 15 | ≤ 0.38 |
| SF5 | 20 | ≤ 0.51 | |||
| SF6 | 25 | ≤ 0.64 | |||