K M D Steel And Tube is leading manufacturers, stockists , supplier & exporter of SS 321/321H Round Bars. The SS 321/321H Round Bars has its applications in aerospace, chemical processing, expansion joints, food processing, petrol refining and more.
These Round Bars are made of best quality raw material and do match national & international quality standard and this helps us to have high demand in the market from our customer. These Round Bars consists of features such as high ductility, good wear & tear capability, good weldability, corrosion resistant, abrasion resistant, good quality strength, good reliability and more. The Bars portray particularly higher resistance to pitting & crevice corrosion in chloride environments, finding it’s greatest application in welding, post annealing, architectural and transportation industries.
These SS 321/321H Round bars are made in different size, dimensions and thickness and are delivered to customers as per their need & requirement. The Round Bars are sold to customers at affordable &market oriented prices.
| Standard | 321 / 1.4541 321H / 1.4878 |
|---|---|
| Designation | ASTM, ASME, AISI A 276 , SA 276, A 479, SA 479 |
| Range | 3 MM TO 350 MM DIA |
| Finish | Bright, Polish & Black |
| Form | Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wire-mesh, Billet, Ingot, Forging Etc. |
| Application | Aerospace – piston engine manifolds, Chemical Processing, Expansion Joints, Food Processing – equipment and storage, Petroleum Refining – polythionic acid service, Waste Treatment – thermal oxidizers. |
| % | Cr | Ni | C | Si | Mn | P | S | N | Ti | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 321 | min:17.0 max:19.0 |
min: 9.0 max:12.0 |
max:0.08 | max:0.75 | max:2.0 | max:0.045 | max:0.03 | max:0.10 | min:5*(C+N) max:0.70 |
Balance |
| 321H | min:17.0 max:19.0 |
min: 9.0 max:12.0 |
min:0.04 max:0.10 |
min:18.0 max:20.0 |
max:2.0 | max:0.045 | max:0.03 | max:0.10 | min:5*(C+N) max:0.70 |
Balance |
| Grade | Tensile Strength ksi (min.) |
Yield Strength 0.2% Offset ksi (min.) |
Elongation - % in 50 mm (min.) |
Hardness (Brinell) MAX |
|---|---|---|---|---|
| 321/321H | 75 | 30 | 40 | 217 |
| Denstiy lbm/in3 |
Coefficient of Thermal Expansion (min/in)-°F |
Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | |
|---|---|---|---|---|---|
| at 68 °F | at 68 – 212°F | at 68 – 1832°F | at 200°F | at 32 – 212°F | in tension (E) |
| 0.286 | 9.2 | 20.5 | 9.3 | 0.12 | 28 x 106 |