Overview
Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength. 321 Stainless Steel Tubes has slightly increased oxidation resistance in sturdy corrosion conditions resulting from tantalum and columbium addition. It is the great version of the carbon alloy, which increases creep resistance and tough strength. It gives higher properties of stress rupture and creeps rupture than grade 304 alloy. It is also using for exposures where intergranular oxidation and sensitization are needed.
Although the 321 Stainless Steel properties are amazing, but the 321H Seamless Tubes specifically do not work well in sulphuric acid, small concentrations, or chloride solutions. Therefore, 321H Tubes should be used for applications needing alternating heating between 850 degrees F and 1600 degrees F.TP 321H Seamless Tubes of high-temperature corrosion resistance are similar to the grade SS304, cannot be toughened by heat treatment, and can be finished only by cold working. Types of ASTM A 312 TP 321H Seamless Tubes are SS 321H Welded Pipe, TP 321H SS Pipes, DIN 1.4878 Steel 321H ERW Seamless Pipe, Steel UNS S32109 EFW Pipes, Stainless ERW Welded Pipe, Stainless Steel 321H Pipe, etc.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
321H Stainless Steel Pipe & Tubes Specification | ASTM A269, ASTM A213, ASTM A312, ASME SA269, ASME SA213, ASME SA312 |
321H Stainless Steel Pipe & Tubes Grades | 202, 304, 304L, 304H, 304LN, 309S, 310S, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, SMO 254, ALLOY 254, 6MO, 6MOLY, UNS S31254 ETC. |
321H Stainless Steel Pipe & Tubes Type | Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish |
321H Stainless Steel Pipe & Tubes Outer Diameter Size | Seamless - 1/2"NB TO 18"NB |
321H Stainless Steel Pipe & Tubes Wall Thickness | Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness) |
321H Stainless Steel Pipe & Tubes Length | 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size. |
321H Stainless Steel Pipe & Tubes Ends | Plain Ends / Beveled Ends |
321H Stainless Steel Pipe & Tubes Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw |
321H Stainless Steel Pipe & Tubes Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
321H Stainless Steel Pipe & Tubes Other Testing | Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc |
321H Stainless Steel Pipe & Tubes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
321 | min. | - | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 | - | 9.0 | 0.10 | Ti=5(C+N) |
321H | min. | 0.04 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 | - | 9.0 | - | Ti=4(C+N) |
Mechanical Properties
Grade | Tensile Strength | Yield Strength | Elongation | Hardness | |
Rockwell B | Brinell | ||||
321 | 515 | 205 | 40 | 95 | 217 |
321H | 515 | 205 | 40 | 95 | 217 |
Applications
1. Food preparation equipment particularly in chloride environments.
2. Laboratory benches & equipment.
3. Coastal architectural panelling, railings & trim.
4. Boat fittings.
5. Chemical containers, including for transport.
6. Heat Exchangers.
7. Woven or welded screens for mining, quarrying & water filtration.
8. Threaded fasteners.
9. Springs.
