SMO 254 is a very high end, molybdenum and nitrogen alloyed super austenitic stainless steel with low carbon content. It demonstrates outstanding resistance to pitting, crevice corrosion stress cracking, and corrosion fatigue uniform corrosion. Alloy 254 SMO is substantially stronger than the common austenitic grades, with strength nearly twice that of 300 series stainless steel. It is also characterized by high ductility and impact strength. With high levels of chromium, molybdenum, and nitrogen, Alloy 254 SMO is frequently used in high chloride environments, such as brackish water, seawater, pulp mill bleach plants, and other chloride process streams. In some applications it has even been found to be a more cost effective substitute for high nickel and titanium alloys.

Characteristics of Hastelloy B-2:

• Has a very low carbon content, which means there is very little risk of carbide precipitation during heating
• Possesses very good resistance in water containing chlorides, therefore, it is suitable for use in seawater as it can be exposed to it for prolonged periods without suffering from crevice corrosion

SMO 254 Chemical Composition, %

C	Cr	Cu	Mn	Mo	N	Ni	P	Si	S	Fe
0.02 max	19.5-20.0	0.5-1.0	1.0 max	6.0-6.5	0.18-0.20	17.5-18.0	0.03 max	0.80 max	1.01 max	Balance

SMO 254 ASTM Specifications:

Smls Tube & Pipe	Welded Tube & Pipe	Bar	Forging	Fitting
A269, A213, A312	A249, A269, A312, A358, A409	A276	A473	A182

Mechanical Properties of SMO 254:
Annealed Material

Tensile Strength	98600 psi or 680 Mpa
Yield	(0.2 % offset) 43500 psi or 300 Mpa
Elongation at break	50 %

Stainless Steel 304 is a T 300 Series Stainless Steel austenitic. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. It is defined as a Chromium-Nickel austenitic alloy. Grade 304 is the standard "18/8" stainless that you will probably see in your pans and cookery tools. Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6mm).

Stainless Steel 304 Chemical Composition, %:

C	Mn	Si	P	S	Cr	Ni	N	Fe
0.08 max	2.0 max	0.75 max	0.045 max	0.030 max	18.0-20.0	8.0-10.5	0.10	Balance

Stainless Steel 304L Chemical Composition, %:

C	Mn	Si	P	S	Cr	Ni	N	Fe
0.03 max	2.0 max	0.75 max	0.045 max	0.030 max	18.0-20.0	8.0-12.0	0.10	Balance

Application of Hastelloy B-3:

• Domestic tools industry
• Architectural panelling, railings & trim
• Heat Exchangers

Mechanical Properties of Stainless Steel 304/304L:

At Room Temperature

	Stainless Steel 304	Stainless Steel 304L
Tensile Strength	515 Mpa min	485 Mpa min
Yield	(0.2 % offset) 205 Mpa min	(0.2 % offset) 170 Mpa min
Elongation (in 50mm)	40 % min	40 % min

Stainless steel 310 is an austenitic heat resistant alloy with excellent resistance to oxidation under mildly cyclic conditions through 2000°F. Its high chromium and nickel contents provide comparable corrosion resistance, superior resistance to oxidation and the retention of a larger fraction of room temperature strength than the common austenitic alloys like Type 304. Stainless 310 is often used at cryogenic temperatures, with excellent toughness to -450°F, and low magnetic permeability.

Application of Hastelloy C-4:

• Heat Exchangers
• Radiant Tubes
• Muffles, retorts, annealing covers
• Coal gasifier internal components

Stainless Steel 310 Chemical Composition, %:

C	Mn	Si	P	S	Cr	Ni	Mo	Cu	Fe
0.25 max	2.0 max	1.5 max	0.045 max	0.03 max	24.0-26.0	19.0-21.0	0.75 max	0.5 max	Balance

Mechanical Properties of Stainless Steel 310::

Tensile Strength	515 Mpa min
Yield	(0.2 % offset) 205 Mpa min
Elongation (in 50 mm)	40 % min

Stainless Steel 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. Grade 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections. Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.

Stainless Steel 316 Chemical Composition, %:

C	Mn	Si	P	S	Cr	Mo	Ni	N
0.08 max	2.0 max	0.75 max	0.045 max	0.03 max	16.0-18.0	2.0-3.0	10.0-14.0	0.10 max

Stainless Steel 316L Chemical Composition, %:

C	Mn	Si	P	S	Cr	Mo	Ni	N
0.03 max	2.0 max	0.75 max	0.045 max	0.03 max	16.0-18.0	2.0-3.0	10.0-14.0	0.10 max

Mechanical Properties of Stainless Steel 316/316L:

	Stainless Steel 316	Stainless Steel 316L
Tensile Strength	515 Mpa min	485 Mpa min
Yield	(0.2 % offset) 205 Mpa min	(0.2 % offset) 170 Mpa min
Elongation (in 50 mm)	40 % min	40 % min

C	Mn	P	S	Si	Cr	Ni	Nb+Ta	N	Fe
0.08 max	2.00 max	0.045 max	0.03 max	0.75 max	17.0-19.0	9.0-12.0	10XC-1.0	0.10 max	Balance

Mechanical Properties of Stainless Steel 347:

Ultimate Tensile Strength	75000 psi or 515 Mpa
Yield	(0.2 % offset) 30000 psi or 205 Mpa
Elongation (in 50 mm)	40 %

Stainless Steel 904L is a non-stabilised low carbon high alloy austenitic stainless steel. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack - both pitting / crevice corrosion and stress corrosion cracking. This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.

Stainless Steel 904L Chemical Composition, %:

C	Mn	Si	P	S	Cr	Mo	Ni	Cu	N
0.02 max	2.0 max	1.0 max	0.045 max	0.035 max	19.0-23.0	4.0-5.0	23.0-28.0	1.0-2.0	0.10 max

Mechanical Properties of Stainless Steel 904L:

Tensile Strength	490 Mpa min
Yield	(0.2 % offset) 220 Mpa min
Elongation (in 50 mm)	35 % min

AL6XN is a super austenitic stainless steel with outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking. AL6XN is a 6 moly alloy that was developed for and is used in highly aggressive environments. It has high nickel (24%), molybdenum (6.3%), nitrogen and chromium contents that give it excellent resistance to chloride stress corrosion cracking, chloride pitting, and exceptional general corrosion resistance. AL6XN is primarily used for its improved pitting and crevice corrosion resistance in chlorides. It is a formable and weldable stainless steel. Because of its nitrogen content, AL6XN has greater tensile strength than common austentitic stainlesses, while retaining high ductility and impact strength.

Stainless Steel AL-6XN Chemical Composition, %:

Ni	Cr	Mo	C	N	Mn	Si	P	S	Cu	Fe
23.5-25.5	20.0-22.0	6.0-7.0	0.03 max	0.18-0.25	2.00 max	1.00 max	0.04 max	0.03 max	0.75 max	Balance

Mechanical Properties of Stainless Steel 347:

Ultimate Tensile Strength	112 ksi (770 Mpa)
Yield	(0.2 % offset) 57 ksi (393 Mpa)
Elongation	44 %