What is S31603 material?

What is UNS S31603 material?

UNS S31603 316L is a solid stainless steel composed of approximately 70% iron, 16-18% chromium, and 10-14% nickel, with low carbon content. It is silver-gray in color and classified as austenitic stainless steel. Its key properties include excellent corrosion resistance, especially in chloride environments, and high strength at elevated temperatures. 316L is primarily used in industries such as marine, medical, and chemical processing. It is often produced through hot rolling and can be further classified into seamless and welded forms for different applications.

 

What is S31603 material equivalent to?

S31603 is equivalent to 316L stainless steel, which has many equivalents across different standards. These include SUS 316L (Japanese JIS), X2CrNiMo17-12-2 and 1.4404 (European EN), 316S11 (British BS), and Z3CND17-11-02 (French AFNOR).

 

What is the UNS number for SS316L?

The UNS number for SS316L is S31603. This refers to the low-carbon version of 316 stainless steel, which is often preferred for welded applications due to its enhanced corrosion resistance.

 

316L stainless steel Composition

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N
316L	Min	-	-	-	-	-	16.0	2.00	10.0	-
	Max	0.03	2.0	0.75	0.045	0.03	18.0	3.00	14.0	0.10

 

316L Grade Mechanical Properties

Grade	Tensile Str (MPa) min	Yield Str 0.2% Proof (MPa) min	Elong (% in 50 mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
316L	485	170	40	95	217

 

316-grade stainless steels Physical Properties

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (µm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100 °C (J/kg.K)	Elec Resistivity (nΩ.m)
			0-100 °C	0-315 °C	0-538 °C	At 100 °C	At 500 °C
316/L/H	8000	193	15.9	16.2	17.5	16.3	21.5	500	740

 

316L Grade Specification Comparison

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
316L	S31603	316S11	-	1.4404	X2CrNiMo17-12-2	2348	SUS 316L

 

Heat Treatment

316L stainless steel is an austenitic stainless steel that generally does not require heat treatment for hardening. However, heat treatment can be used for stress relief or annealing:

Annealing: Heat to 1010–1120°C (1850–2050°F), followed by rapid cooling (usually water quenching) to restore its corrosion resistance and maintain its mechanical properties.

Stress Relieving: Heat to 450–600°C (840–1110°F) for 1–2 hours, then air cool.

Post-weld heat treatment is usually not required due to its low carbon content, which minimizes carbide precipitation.

 

What is the difference between UNS S31600 and SS316?

There is no difference between UNS S31600 and SS316; they are two different naming conventions for the same austenitic stainless steel alloy. UNS S31600 is the Universal Numbering System (UNS) designation, while "SS316" is a common industry designation for the stainless steel grade. Both refer to a molybdenum-bearing grade that is more corrosion-resistant than SS 304.

 

What is the difference between S31603 and 316L?

The main difference lies in the carbon content: S31603 (316L) has a maximum carbon content of 0.03%, while S31600 (316) has a maximum carbon content of 0.08%. The lower carbon content of 316L makes it more corrosion-resistant after welding because it avoids sensitization and intergranular corrosion without post-weld heat treatment. However, the higher carbon content of 316 results in slightly higher yield strength and tensile strength.

 

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