1.4420 S31655 Stainless Steel bar

1.4420 (UNS S31655) stainless steel bar, also known as 316LN stainless steel, is a high-nitrogen austenitic stainless steel designed to deliver improved mechanical strength and excellent corrosion resistance. Compared with conventional 316L, S31655 offers higher yield strength, enhanced resistance to pitting and crevice corrosion, and superior performance in chloride-containing environments. It maintains good toughness at low temperatures and provides excellent weldability without the need for post-weld heat treatment. 1.4420 stainless steel bars are widely used in pressure vessels, chemical processing equipment, offshore structures, and cryogenic applications where reliability and durability are critical.

Specifications of 1.4420 SS round bar:

Specifications	ASTM: A276,EN 10088-3
Grade	1.4420,S31655,etc.
Length	1000 mm – 6000 mm or as requested
Diameter Range	10 mm – 200 mm (custom available)
Technology	Hot Rolled / Forged / Cold Drawn
Surface Finish	Bright, Peeled, Polished, Turned, Pickled
Form	Round, Square, Flat, Hexagonal

 

S31655 round bar Equivalent Grades:

STANDARD	DIN
S31655	1.4420

Chemical Composition 1.4420 stainless steel rod:

C	Cr	Mo	Mn	Ni	P	S	Si	N
0.03	16.5-18.5	2.0-3.0	2.0	10.5-13.5	0.045	0.015	1.0	0.12-0.22

 

Mechanical Properties Of S31655 SS round bar:

Property	Value (Typical)	Unit
Tensile Strength (Rm)	600 – 850	MPa
Yield Strength (Rp0.2)	≥ 290	MPa
Elongation (A5)	≥ 40	%
Hardness (HB)	≤ 215	HB

 

Applications of 15-7PH steel round bar:

• Pressure vessels and heat exchangers

• Chemical and petrochemical equipment

• Offshore and marine engineering

• Nuclear and power generation components

• Cryogenic storage tanks and piping systems

FAQ

Q1: What is 1.4420 stainless steel?
A1: 1.4420 is a European standard designation for UNS S31655, commonly known as 316LN stainless steel. It is a high-nitrogen austenitic stainless steel offering higher strength and improved corrosion resistance compared with standard 316L.

Q2: What is the difference between S31655 and 316L?
A2: S31655 (316LN) contains a higher nitrogen content than 316L, which significantly increases yield strength and improves resistance to pitting and crevice corrosion, while maintaining excellent weldability and toughness.

Q3: Is 1.4420 stainless steel suitable for low-temperature applications?
A3: Yes. 1.4420 stainless steel maintains excellent toughness and mechanical stability at low and cryogenic temperatures, making it suitable for pressure vessels, LNG equipment, and cryogenic storage systems.

Q4: What forms and sizes of 1.4420 stainless steel bar are available?
A4: 1.4420 stainless steel bars are available in round, square, and hex forms. Common diameters range from 6 mm to 500 mm, with custom sizes and cut-to-length services available upon request.

Q5: Can 1.4420 / S31655 stainless steel bar be welded?
A5: Yes. S31655 stainless steel offers excellent weldability using standard welding methods. Post-weld heat treatment is generally not required, provided proper welding procedures are followed.

Why Choose SAKYSTEEL :

Reliable Quality – Our stainless steel bars, pipes, coils, and flanges are manufactured to meet international standards such as ASTM, AISI, EN, and JIS. Strict Inspection – Every product undergoes ultrasonic testing, chemical analysis, and dimensional control to ensure high performance and traceability. Strong Stock & Fast Delivery – We maintain regular inventory of key products to support urgent orders and global shipping. Customized Solutions – From heat treatment to surface finish, SAKYSTEEL offers tailor-made options to match your exact requirements. Professional Team – With years of export experience, our sales and technical support team ensures smooth communication, quick quotations, and full documentation service.

SAKY STEEL'S Quality Assurance (including both Destructive and Non-Destructive) :

1. Visual Dimension Test 2. Mechanical examining like tensile, Elongation and reduction of area. 3. Impact analysis 4. Chemical examination analysis 5. Hardness test 6. Pitting protection test 7. Penetrant Test 8. Intergranular Corrosion Testing 9. Roughness Testing 10. Metallography Experimental Test

Custom Processing Capabilities:

• Cut-to-size service

• Polishing or surface conditioning

• Slitting into strips or foil

• Laser or plasma cutting

• OEM/ODM welcome

SAKY STEEL supports custom cutting, surface finish adjustments, and slit-to-width services for N7 nickel plates. Whether you need thick plates or ultra-thin foil, we deliver with precision.

SAKY STEEL'S Packaging:

1. Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging. 2. Saky Steel's pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as,