Grade 310, combining excellent high temperature properties with good ductility and weld ability, is designed for high temperature service. It resists oxidation in continuous service at temperatures up to 11500C provided reducing sulphur gases are not present. It is also used for intermittent service at temperatures up to 10400C.

Grade 310S (UNS S31008) is used when the application environment involves moist corrodents in a temperature range lower than that which is normally considered "high temperature" service. The lower carbon content of 310S does reduce its high temperature strength compared to 310. 

Like other austenitic grades these have excellent toughness, even down to cryogenic temperatures, although other grades are normally used in this environment.

    Grade 310L (and proprietary versions of this grade), is a 0.03% maximum carbon version of 310, sometimes used for very specific    corrosive environments, such as urea production.

 Product Range

   Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
   Sizes (Seamless): 1/2" NB - 24" NB
   Sizes (ERW): 1/2" NB - 24" NB
   Sizes (EFW): 6" NB - 100" NB  

    Wall Thickness available:
    Schedule 5S - Schedule XXS (heavier on request)

   Other Materials Testing:

    NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.

 Dimensions:

    All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.

 Composition 310 Stainless Steel Pipes and Tubes

    Typical compositional ranges for grade 310 stainless steels are given in table 1.

   Table 1. Composition ranges for 310 grade stainless steel

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
310	min. max.	- 0.25	- 2.00	- 1.50	- 0.045	- 0.030	24.0 26.0	-	19.0 22.0	-
310S	min. max.	- 0.08	- 2.00	- 1.50	- 0.045	- 0.030	24.0 26.0	-	19.0 22.0	-

 Mechanical Properties 310 Stainless Steel Pipes and Tubes

    Typical mechanical properties for grade 310 stainless steels are given in table 2.

   Table 2. Mechanical properties of 310 grade stainless steel 

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
310	515	205	40	95	217
310S	515	205	40	95	217

 Physical Properties of 310 Stainless Steel Pipes and Tubes

    Typical physical properties for annealed grade 310 stainless steels are given in table 3.

   Table 3. Physical properties of 310 grade stainless steel in the annealed condition

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/S	7750	200	15.9	16.2	17.0	14.2	18.7	500	720

 Grade Specification Comparison of 310 Stainless Steel Pipes and Tubes

    Approximate grade comparisons for 310 stainless steels are given in table 4.

   Table 4. Grade specifications for 310 grade stainless steel 

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
310	S31000	310S24	-	1.4840	X15CrNi25-20	-	SUH 310
310S	S31008	310S16	-	1.4845	X8CrNi25-21	2361	SUS 310S
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

 Corrosion Resistance of 310 Stainless Steel Pipes and Tubes

The high chromium content - intended to increase high temperature properties - also gives these grades good aqueous corrosion resistance. The PRE is approximately 25, and seawater resistance about 220C, similar to that of Grade 316. Excellent resistance at normal temperatures, and when in high temperature service exhibits good resistance to oxidizing and carburizing atmospheres. Resists fuming nitric acid at room temperature and fused nitrates up to 4250C.Subject to stress corrosion cracking but more resistant than Grades 304 or 316.

 Heat Treatment of 310 Stainless Steel Pipes and Tubes

Solution Treatment (Annealing) - heat to 1040-11500C and cool rapidly for maximum corrosion resistance. This treatment is also recommended to restore ductility after each 1000 hours of service above 6500C, due to long term precipitation of brittle sigma phase. These grades cannot be hardened by thermal treatment.

 Applications of 310 Stainless Steel Pipes and Tubes

    Typical applications include:

       Furnace parts
       Oil burner parts
       Carburizing boxes
       Heat Treatment baskets and jigs
       Heat Exchangers
       Welding filler wire and electrodes