654 SMO (UNS S32654 / W.Nr. 1.4652)

654 SMO (UNS S32654 / W.Nr. 1.4652) is a super austenitic stainless steel containing 23% nickel, 25% chromium and 7% molybdenum. Its corrosion resistance is comparable to that of the best nickel-based alloy. As the nitrogen content of 654SMo is twice as high as 254SMo , its intensity is higher than 904L and 254SMo. There are two smelting method for 654SMo super austenitic stainless steel: 1) the currently popular argon-oxygen decarburization refining smelting in abroad -VOD or AOD; 2) continuous casting method used for producing stainless steel.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
654 SMO Acero 654SMo	00Cr24Ni22Mo7Mn3CuN	–	–	S32654	–	1.4652	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	Fe
654 SMO	≤0.02	≤0.50	2.0-4.0	≤0.03	≤0.005	24.0-25.0	21.0-23.0	7.0-8.0	0.3-0.6	0.45-0.55	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HB
8.0	1110-1210	750	430	40	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM A479, ASTM B276
Plate, Sheet and Strip	ASTM A240, ASTM B480
Pipe and Tube	ASTM A358, ASTM A312, ASTM A409, ASTM A813, ASTM A814, ASTM B690
Welding Product	–
Others	ASTM B366

Features

Due to its high molybdenum, when 654S MO super austenitic stainless steel is subjected to seamless pipe perforation, it is hard and sticky, easy to get eccentric or crack. To avoid the risk in perforation, our company chooses to punch holes in the center of round steels and then directly put on the rolling mill for cold rolling or cold drawing to produce seamless pipe. Although the cost is increased, it secures high success rate.

654SMo (S32654, 1.4652) super austenitic stainless steel features very good local corrosion resistance, good pitting resistance and good stress corrosion resistance under seawater, aeration, gap and low speed scouring conditions. It can be used as a good substitute to nickel-based alloys and titanium alloys. When it comes to high-temperature resistance or corrosion resistance, it is also superior to 904L and 254SMo.

Applications

Pressurized and erosive systems handling chlorinated sea water at higher temperatures
Plate heat exchangers
Flue gas cleaning
Process equipment in chemical industry
Bleaching equipment in the pulp and paper industry
Desalination
Hydrometallurgy
Food and beverage
Pharmaceuticals