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Duplex Stainless Steels have a structure that contains both ferrite and austenite. Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures. The corrosion resistance of duplex alloys depends primarily on their composition, especially the amount of chromium, molybdenum, and nitrogen they contain.
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UNS |
JIS |
En |
DIN |
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S31803 |
QS2205 |
1.4462 |
X2CrNiMoN22-5-3 |
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S32205 |
QS2205 |
1.4462 |
X2CrNiMoN22-5-3 |
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S32304 |
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| S32750 |
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1.4410 |
X2CrNiMoN25-7-4 |
| S32760 |
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Note: PREN=Cr%+3.3×Mo%+16×N% |
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UNS |
Tensile Strength
Min, Mpa |
Yield Strength
Min, Mpa |
Elongation in 2INCH.
Or 50mm Min, % |
Hardness Max,
HRC |
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S31803 |
620 |
450 |
25 |
30 |
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S32205 |
655 |
485 |
25 |
30 |
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S32304 |
690 |
450 |
25 |
30 |
| S32750 |
800 |
550 |
25 |
32 |
| S32760 |
750 |
550 |
25 |
32 | |
| Note: a represent OD equal to 1 INCH or Less |
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ASTM A789/ASME SA789 Seamless and welded ferritic/austenitic stainless steel tubing for general service
ASTM A790/ASME SA790 Seamless and welded ferritic/austenitic stainless steel pipe
ASTM A312/ASME SA312 Seamless and welded austenitic stainless steel pipes
ASTM A240 Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate,
Sheet, and Strip for Pressure Vessels and for General Applications
EN10216-5 Seamless steel tubes for pressure purposes - stainless steel tubes
DIN17456 General purpose seamless circular stainless steel tubes - technical delivery conditions
DIN17458 Seamless circular austenitic stainless steel tubes subject to special requirements –
technical delivery conditions
JIS G3459 Stainless steel pipes
JIS G3463 Stainless steel boiler and heat-exchanger tubes
GOST 9941 Seamless cold and warm deformed tubes of corrosion-resistant steel - specifications |
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1.100% PMI / SPECTRO CHEMICAL ANALYSIS TESTS 100% PMI
2.100% DIMENSION TESTS & 100% VISUAL EXAMINATION
3.TENSION TEST, FLARING TESTS(FOR SEAMLESS TUBE/PIPE)/FLANGE TESTS(FOR WELDED TUBE/PIPE), HARDNESS TEST, REVERSED FLATTENING TEST
4.100% HYDROSTATIC TEST/100% NON-DESTRUCTIVE TESTS 100%水壓實驗/100%無損檢測
NOTES : ALL THE TESTS AND INSPECTION NEED TO PROVIDE WITH REPORTS ACCORDING TO STANDARD AND TEST RESULTS |
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1.STRAIGHTNESS TEST
2.ROUGHNESS TEST
3.CRYSTALLING PHASE ANALYSIS
4.INTERGRANULAR ATTACK TESTS
5.SHIPPING NOTIFICATION BEFORE SHIPMENT
6 .IMPACT ATTACK TEST UNDER LOW TEMPERATURE |
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a. MTC (MATERIAL TEST CERTIFICATION) ACCORDING TO EN10204/3.1 OR EN 10204/3.2
b.RAW MATERIAL CERTIFICATION
c.ALL THE TEST & INSPECTION REPORTS AS PER PO AND STANDARDS
d.HEAT TREATMENT REPORT
e.SHIPPING NOTIFICATION BEFORE SHIPMENT
f.QUALITY WARRANTY LETTER | |
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