Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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Overview:
Most stainless steel tubing is heat treated by the bright annealing process, in which the tubing is annealed in a protective medium to prevent discoloration of the bright surface. Since austenitic stainless steel is the most often used tubing material, the heat treatment process is bright annealing of austenitic stainless steel in essence.
The stainless steel tubing is generally produced by a cold-drawing process. A subsequent annealing process is required to eliminate residue stress and obtain improved softness and ductility. Meanwhile, since chromium carbides formed at the grain boundaries during high-temperature exposure may result in susceptibility of the austenitic stainless steel to intergranular corrosion, they must be dissolved during annealing before cooling begins. If the annealing is conducted in a protective atmosphere such as pure hydrogen or dissociated ammonia, the formation of an oxide layer on the tubing exterior and interior surfaces can be completely avoided. The stainless steel tubing maintains its original metal luster as well as excellent surface finish. There is no need for a subsequent pickling process.
Specification:
| Specification | ASTM A213 & Its equivalent ASME, DIN & EN Standard. |
| Grades | 304, 304H, 304L, 304LN. |
| Type | Superheater, Seamless Ferritic and Austenitic Boiler and Heat-Exchanger Tubes |
| Outer Diameter Size | 1/4” OD, NB to 3” OD, NB sizes |
| Wall Thickness | 1mm to 12mm, SCH 5/5S, 40/40S, 10/10S, 20/20S, 80/80S, 120/120S, 160/160S as per ANSI B36.19/36.10 |
| Length | Up to 6 meters, custom cut lengths |
| Ends | No.4 finish, No.1 Pickled Finish, BA Finish, Electropolished Seamless Tubes |
| Other Testing | Product Analysis, Radiographic Examination, Transverse Tension Test, Flattening Test, Etching Test, Stabilizing Heat Treatment, Intergranular Corrosion Test, Grain Size Test, NACE 0175, Dual Grade, Weld Decay Test, Magnetic Particle Detection, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc |
| Dimension | All Pipe & Tube Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME |
| Packaging | Loose / Bundle / Plastic Cloth Wraps / Wooden Pallet / Wooden Box / Plastic End Caps / Beveled Protector |
Chemical Composition:
| Grade | UNS | C | Mn | P | S | Si | Cr | Ni |
| 304 | S30400 | 0.08 max | 2.00 max | 0.045 max | 0.03 max | 1.00 max | 18.0-20.0 | 8.0-11.0 |
| 304L | S30403 | 0.035 max | 2.00 max | 0.045 max | 0.03 max | 1.00 max | 18.0-20.0 | 8.0-12.0 |
| 304H | S30409 | 0.04-0.10 | 2.00 max | 0.045 max | 0.03 max | 1.00 max | 18.0-20.0 | 8.0-11.0 |
Mechanical Properties:
| Grade | Tensile Strength, min, ksi (MPa) | Yield Strength, min, ksi (MPa) | Elongation in 2 in. or 50mm, min (%) | Hardness | Solutioning Temperature, min, °F(°C) | |
| Rockwell | Brinell/Vickers | |||||
| 304 | 75(515) | 30(205) | 35 | 90HRB | 192HBW/200HV | 1900(1040) |
| 304L | 70(485) | 25(170) | 35 | 90HRB | 192HBW/200HV | 1900(1040) |
| 304H | 75(515) | 30(205) | 35 | 90HRB | 192HBW/200HV | 1900(1040) |
Equivalent Grades:
| Standard | WERKSTOFF NR. | Unified Numbering System | European Standards | AFNOR | British Standards | GOST | Japanese Standards |
| 304 | 1.4301 | S30400 | X5CrNi18-10 | Z7CN18‐09 | 304S31 | 08Х18Н10 | SUS 304 |
| 304L | 1.4306 / 1.4307 | S30403 | X2CrNi18-9 / X2CrNi19-11 | Z3CN18‐10 | 304S11 | 03Х18Н11 | SUS 304L |
| 304H | 1.4948 | S30409 | X6CrNi18-10 | Z6CN18-09 | 304S51 | 08KH18N10 | SUS 304H |
Applications:
1.Oil & Gas Equipments
2.Offshore Technology
3.Seawater Desalination Plants
4.Chemical Industry
5.Bridges
6.Storage Tanks
7.Medical Industry
8.Civil Engineering
9.Pressure Vessels, Reactor Tanks, and Heat Exchangers
10.Rotors, Impellers and Shafts
11.Power Plants
12.Petrochemical
13.Shipbuilding Industry
