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[China]
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Address: 20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
Contact name:Jikin Cai
Yuhong Group Co.,Ltd |
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ASTM A358 TP321 Welded Austenitic Stainless Steel Pipe For high tempersture
YUHONG GROUP deal with stainless steel seamless pipe and tube already more than 33 years, every year sell more than 80000 tons of stainless steel seamless pipe and tube. Our client already cover more than 65 countries. Our stainless steel seamless pipe and tube was width used in Mining, Energy, Petrochemical, Chemical Industry, Food plant, Paper plant, Gas and Fluid Industry etc.
Description
321 stainless steel (uns nos32100) Grade 321 and 347 are the basic
austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) or
Niobium (347) additions. These grades are used because they are not
sensitive to intergranular corrosion after heating within the
carbide precipitation range of 425-850°C. Grade 321 is the grade of
choice for applications in the temperature range of up to about
900°C, combining high strength, resistance to scaling and phase
stability with resistance to subsequent aqueous corrosion.
Grade321H is a modification of 321 with a higher carbon content, to
provide improved high temperature strength.
A limitation with 321 is that titanium does not transfer well
across a high temperature arc, so is not recommended as a welding
consumable. In this case grade 347 is preferred - the niobium
performs the same carbide stabilisation task but can be transferred
across a welding arc. Grade 347 is therefore the standard
consumable for welding 321. Grade 347 is only occasionally used as
parent plate material.
Like other austenitic grades, 321 and 347 have excellent forming
and welding characteristics, are readily brake or roll formed and
have outstanding welding characteristics. Post-weld annealing is
not required. They also have excellent toughness, even down to
cryogenic temperatures. Grade 321 does not polish well, so is not
recommended for decorative applications.
Grade 304L is more readily available in most product forms, and so
is generally used in preference to 321 if the requirement is simply
for resistance to intergranular corrosion after welding. However
304L has lower hot strength than 321 and so is not the best choice
if the requirement is resistance to an operating environment over
about 500°C.
Five classes of pipe are covered as follows
Class 1—Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.
Class 2—Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.
Class 3—Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.
Class 4—Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal (see 6.2.2.1 and 6.2.2.2).
Class 5—Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.
Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 5(C+N) – 0.70 max |
SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Application
Heat Exchanger & Boiler
Oil & Gas Refining
Oil & Gas Pipeline
Petrochemical Industry
Pharmaceutical Industry
Food Industry
Water Treatment
Onshore & Offshore Platform, Ship building
Electric Plant, Sugar Plant, Paper making factory
Others
