Sandvik Saf 2507®
China united iron and steel limited exported stainless steel grade: ASTM/ASME Grade 304, Grade 304L,304h, 316, 316L, 316H, 316TI, 321, 321H, Stainless steel manufacturer 309S, 309H, 310S, 310H, 410S, 2205, 904L, 2507, 254, gh3030, 625, 253MA, S30815, 317L, Type 317, 316lN, 8020, 800, 800H, C276, S32304 and others special requirement stainless steel grade.
Stress Corrosion Cracking
A testing program carried out at Sandvik Materials Technology has confirmed that tendency to HISC is lowered when austenite spacing is less than 30 μm, as recommended by DNV RP-F112. Cold pilgered and resolution annealed tubes with austenite spacing between 5-15 μm have proven excellent resistance to HISC underneath utilized stress up to 130% of the yield strength without cracking. Supplied within the annealed condition, the Sandvik SAF2507 achieves yield strengths of 80ksi (550Mpa), higher than most austenitic and duplex stainless-steel grades.
This is significantly greater than e.g. the PRE values for different duplex stainless steels of the 25Cr sort which aren’t tremendous-duplex. In tremendous duplex stainless steels, cracks are inclined to propagate in the embrittled ferrite part and arrest at ferrite-austenite part boundaries. Susceptibility to HISC considerably increases with increasing austenite spacing.
- Sandvik SAF 2507® is a member of the family of modern duplex stainless steels whose chemical composition is balanced to provide quick reformation of austenite within the high temperature warmth affected zone of a weld.
- The grade can be suitable for hydraulic and instrumentation purposes in tropical marine environments.
- This leads to a microstructure that provides the material with good resistance to intergranular corrosion.
- Sandvik SAF 2507® passes testing to ASTM A262 Practice E (Strauss check) with out reservation.
- In Sandvik SAF 2507® the PRE worth is equal in each phases, which has been achieved by a cautious steadiness of the weather.
What is super duplex stainless steel?
SuperDuplex stainless like Duplex, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Superduplex has a higher Molybdenum and Chromium content which gives the material greater corrosion resistance.
Compared to austenitic stainless steels, Sandvik SAF 2507® has a higher proof and tensile power. Normal increasing methods can be used, but the enlargement requires larger preliminary drive and ought to be undertaken in one operation. As a common rule, tube to tubesheet joints should be welded if the service situations embody a high chloride focus, thus limiting the chance of crevice corrosion. The mechanical properties combined with corrosion resistance give Sandvik SAF 2507® a great resistance to erosion corrosion. Testing in sand containing media has shown that Sandvik SAF 2507® has an erosion corrosion resistance higher than corresponding austenitic stainless steels.
Sandvik SAF 2507® is a member of the household of contemporary duplex stainless steels whose chemical composition is balanced to give fast reformation of austenite within the excessive temperature warmth affected zone of a weld. This ends in a microstructure that provides the fabric with good resistance to intergranular corrosion. Sandvik SAF 2507® passes testing to ASTM A262 Practice E (Strauss take a look at) without reservation. In Sandvik SAF 2507® the PRE worth is equal in each phases, which has been achieved by a careful stability of the elements. The grade is also suitable for hydraulic and instrumentation applications in tropical marine environments.
Alloy is listed in NACE MR 0175 for bitter service and having gained ASME Approval for Pressure Vessel functions it may be used in a wide variety of purposes. Ferralium® 255 weld wire is produced to enhance our main super duplex stainless-steel. Careful formulation of the weld wire composition ensures the optimum combination of weld energy and corrosion resistance, achieved by over-alloying the wire with Nickel to take care of the proper (austenite / ferrite) section steadiness. Sanmac® 2205 is a 22% Cr duplex stainless steel with improved machinability as normal.
It can’t be hardened by warmth therapy but could be strengthened by chilly working. The Saf2507 also exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures as much as 300°C.