310s Stainless steel 1.4845(UNS31008)

Stainless steel 310

Stainless steel 310 is an austenitic heat resistant alloy with phenomenal resistance to oxidation under mildly cyclic conditions through 2000ºF. Its nickel and high chromium contents provide similar 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 frequently utilized at cryogenic temperatures, with excellent toughness to -450°F.temperatures, with excellent toughness to -450°F, and low magnetic permeability.

Stainless steel 310S

Stainless steel 310S is austenitic chromium, nickel stainless steel (.08% max carbon) with good oxidation resistance and strength at high temperatures. It resist oxidation in continuous service up to 2000ºF gave decreasing sulphur gasses are not present. It is additionally utilized for intermittent service at temperatures up to 1900°F due to it resists rescaling and has a low coefficient of expansion. This factor reduces the tendency of the steel to warp in heat service. 310s are same as 310 aside from lower carbon content to minimize carbide precipitation during welding.

310/310S Form

• SHEET
• PLATES
• ROUND BAR
• TUBES/PIPES
• WIRE

Applications for 310/310S stainless steel

• Oil and Gas industries
• Pharmacy industries
• Textile industries
• Water Piping Systems
• Acid and Chemical industries
• Beverage industries
• Refinery Plants
• Automobile industries
• Cement industries
• Food industries
• Paper and Pulp industries

Equivalents of grade 310/310S

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
SS 310	1.4841	S31000	S31000	310S24	20Ch25N20S2	–	X15CrNi25-20
SS 310S	1.4845	S31008	SUS 310S	310S16	20Ch23N18	–	X8CrNi25-21

Composition ranges for 310/310S grade of stainless steel

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
SS310	min.max.	–0.25	–2.00	–1.50	–0.045	–0.030	24.026.0	–	19.022.0	–
SS310S	min.max.	–0.08	–2.00	–1.50	–0.045	–0.030	24.026.0	–	19.022.0	–

Mechanical Properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
SS 310	515	205	40	95	217
SS 310S	515	205	40	95	217

 Physical Properties

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (m/m/0C)			Thermal Conductivity (W/m.K)		Specific Heat 0-1000C (J/kg.K)	Electrical Resistivity (n.m)
			0-1000C	0-3150C	0-5380C	at 1000C	at 5000C
310 / 310S	7750	200	15.9	16.2	17.0	14.2	18.7	500	720

Corrosion Resistance

310 / 310S stainless steel (1.4845) has excellent corrosion resistance at normal temperatures but is primarily designed to perform at high temperatures. In these high-temperature environments, 310 / 310S  (1.4845) maintains very good corrosion resistance and also has exceptional resistance to; oxidizing and carburizing atmospheres and other forms of hot corrosion, up to a maximum dry air service temperature of 1100ºC. Other corrosive compounds such as water and sulphur compounds will significantly reduce the maximum service temperature.

HEAT RESISTANCE:

Good resistance to oxidation in intermittent service in air at temperatures up to 1040°C and 1150°C in continuous service.

Good resistance to thermal fatigue and cyclic heating.

Widely used where sulphur dioxide gas is encountered at elevated temperatures.

Continuous use in 425-860°C range not recommended due to carbide precipitation, if subsequent aqueous corrosion resistance is needed

Generally used at temperatures starting from about 800 or 900°C – above the temperatures at which 304H and 321 are effective.

Heat Treatment

Heat Treatment Type 310/310S are solution annealed by heating to temperature range 1040 -1065°C, holding at temperature until thoroughly soaked, then water quenching.

Hot Working

After uniform heating to 2150 F (1177 C) most common hot work techniques can be successfully performed. Do not forge down 1800 F (982 C). Fast cooling is required to maximize corrosion resistance.

Cold Working

In spite of the fact that this alloy has a high work hardening rate, this alloy can be drawn, headed, upset and stamped. To remove internal stress full annealing is required after cold work.

Annealing

1900-2050 F (1038-1121 C) water quench.

Hardening

This alloy doesn’t reply to heat treatment. Cold work will cause an increase in both hardness and streng

Machinability

Machinability Grades 310/310SS are similar in machinability to type 304. Work hardening can be a problem and it is normal to remove the work hardened layer by using slow speeds and heavy cuts, with sharp tools and good lubrication. Powerful machines and heavy, rigid tools are used.

WELDABILITY:

Austenitic stainless steel is generally considered to be weldable

Generally considered to have weldability equivalent to 304 and 304L

Special consideration is needed to compensate for a higher coefficient of thermal expansion to avoid warping and distortion