What is 1.4436 Stainless Steel?

1.4436 stainless steel, commonly known as 316L or UNS S31603, is a low-carbon version of the standard 316 molybdenum-alloyed austenitic stainless steel. Its reduced carbon content enhances resistance to intergranular corrosion in the as-welded condition, making it the preferred choice for heavy welded fabrications, chemical processing equipment, pharmaceutical devices, and marine applications where both corrosion resistance and weld integrity are critical.

 

This low-carbon molybdenum-enhanced grade is standardized under all major international systems.

	1.4436
	316L, UNS S31603
	SUS316L
	STS316L

The low carbon content and molybdenum addition are key to its performance.

	C			P	S
	<= 0.03	<= 1.0	<= 2.0	<= 0.045	<= 0.03	16.5 - 18.5	10.0 - 13.0	2.0 - 2.5

It offers good strength and excellent ductility, similar to standard 316.

	Yield Strength (Rp0.2)
	>= 200 MPa	490 - 690 MPa	>= 40%	<= 215

 

Key Characteristics and Applications of 1.4436 / 316L

The low carbon content minimizes chromium carbide formation during welding, preventing intergranular corrosion in the heat-affected zone without the need for post-weld heat treatment.

The molybdenum addition provides significantly better resistance to pitting and crevice corrosion in chloride-containing environments compared to 304/304L.

Offers improved performance in sulfuric, phosphoric, and acetic acid environments.

 

Tanks, reactors, piping, and vessels for corrosive media.

Boat fittings, offshore platforms, and components exposed to seawater or salt spray.

Surgical instruments, implants, and equipment requiring sterilization and high cleanliness.

High-end façades and structures in polluted or coastal atmospheres.

 

When should I choose 316L (1.4436) over 316 (1.4401)?
Choose 316L when the component will be heavily welded and cannot be post-weld heat treated, or when it will be used in the sensitization temperature range (450–850℃). For applications with minimal welding or where higher ambient strength is needed, standard 316 may be suitable. 316L is also preferred for aggressive corrosive environments where weld integrity is critical.

 

Does 316L have lower mechanical strength than 316 due to its lower carbon content?
In practice, the difference in room-temperature mechanical properties between annealed 316 and 316L is minimal and often within specification overlap. Both grades meet similar minimum strength requirements. The primary advantage of 316L is its corrosion resistance after welding or high-temperature exposure, not a reduction in ambient strength.

Looking for a Reliable Supplier of 1.4436 / 316L Stainless Steel?
GNEE Steel supplies high-quality 316L (1.4436) stainless steel in all standard forms-plate, sheet, coil, pipe, bar, and wire-along with comprehensive processing services such as cutting, bending, and surface finishing. We provide full material certification (EN 10204 3.1) and ensure timely delivery for both stock and custom orders. If you have any requirements, please feel free to contact us.