SS 321/321H Pipes – High-Temperature & Corrosion Resistant

KVN ia a trusted provider and stockist of high-grade stainless steel solutions, offering premium SS 321 and SS 321H Pipes & Tubes. These products are manufactured using top-tier raw materials and meet stringent international quality standards. Whether required in standard formats or tailored to specific project requirements, each unit is produced with a focus on consistency, durability, and dimensional precision. Every pipe and tube undergoes rigorous inspection to ensure they deliver superior performance across diverse industrial applications. Our supply chain network spans across India, the United Arab Emirates (UAE), the Kingdom of Saudi Arabia (KSA), Kuwait, Qatar, the Sultanate of Oman, Iran, and Iraq—ensuring timely delivery and reliable service across key regions.

Technical Overview

SS 321H is an enhanced carbon version of stainless steel 321, specifically developed to provide superior performance under prolonged high-temperature exposure. Known for its enhanced resistance to deformation under stress, it is particularly suitable for thermal environments requiring sustained strength. These pipes and tubes deliver robust mechanical characteristics, including strong tensile and yield properties, good elongation capacity, and efficient thermal conduction—making them reliable in structurally demanding and heat-intensive applications. They are available in a wide range of configurations including seamless, welded, square, round, rectangular, polished, and electro-polished forms. Composed of a balanced combination of chromium, nickel, titanium, and trace elements like carbon and silicon, they offer long-term reliability and metallurgical stability even under fluctuating thermal cycles and corrosive conditions.

Applications & Industry Use

The robustness and thermal endurance of SS 321/321H and ASTM A358 304L EFW Pipes & Tubes make them a preferred choice for critical applications across industries. They are commonly used in sectors like oil and gas, petrochemicals, power generation, pulp and paper, and pharmaceuticals. These pipes are particularly effective in high-temperature environments such as heat exchangers, flue gas systems, chemical reactors, and condensers. Their resistance to oxidation and carbide precipitation makes them ideal for aerospace components, marine exhaust systems, and food processing units where structural integrity and corrosion resistance are paramount. Additionally, they are rigorously tested through various quality control methods such as PMI, hydrostatic, radiographic, flattening, and intergranular corrosion tests to ensure reliability in demanding conditions.

321/321H Stainless Steel Pipes and Tubes Equivalent Grades

STANDARD	UNS	WNR.	EN	JIS
SS 321	S32100	1.4541	X6CrNiTi18-10	SUS 321
SS 321H	S32109	1.4878	X12CrNiTi18-9	SUS 321H

SS 321/321H Seamless Pipes

ASME SA 312 Stainless Steel 321 Seamless Pipes, UNS S32100 Seamless Pipes, DIN 1.4541 Seamless Pipes, SS S32109 Seamless Piping, DIN 1.4878 Seamless Pipe

SS 321/321H Seamless Tubes

ASME SA213 SS 321 Seamless Tube, ASTM A213 Stainless Steel 321H Seamless Tubing, DIN 1.4541 Seamless Tubes, UNS S32100 / S32109 Seamless Tube

SS 321/321H Welded Pipes

Stainless Steel ASTM A312 TP321 Welded Pipes Supplier, UNS S32100 Welded Pipe, ASME SA312 SS 321H Welded Pipes, DIN 1.4541 / 1.4878 Welded Pipe

SS 321/321H Welded Tubes

DIN 1.4541 Welded Tubing, DIN 1.4878 Welded Tube, ASTM A213 / ASME SA 213 Stainless Steel 321H Welded Tubes, UNS S32100 / S32109 Welded Tubes

SS 321/321H EFW Pipes

ASME SA358 SS 321 EFW Pipes, ASTM A358 TP321 EFW Stainless Steel Pipe, SS UNS S32100 EFW Pipes, S32109 EFW Pipe, SS DIN 1.4541 / DIN 1.4878 EFW Pipe Exporter

SS 321/321H ERW Pipes & Tubes

UNS S32109 ERW Pipes, Stainless Steel 321 ERW Tubing, ASTM A213 TP321H Stainless Steel ERW Tubes, ASME SA 312 SS 321 ERW Pipe

Stainless Steel Pipe Specification :

ASTM A312, A358 / ASME SA312, SA358

SS Tube Specification :

ASTM A213, A269, A249, A511, A554 / ASME SA213, SA269, SA249, SA511, SA554

Pipe Size :

1/8” NB to 24” NB, 1/4” OD to 24” OD sizes.

Tube Size :

1/2" OD to 8" OD.

Thickness Range :

0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS

Type :

Seamless / ERW / Welded / Fabricated Pipes

Form :

Round, Square, Rectangular, Oval, Hydraulic Etc

Length :

Single Random, Double Random & Required Length

End :

Plain End, Beveled End, Treaded

End Protection :

Plastic Caps

Outside Finish :

2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements

Delivery Condition :

Annealed and Pickled, Polished, Bright Annealed, Cold Drawn

Inspection, Test Reports :

Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports

Packing :

Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests

Specials :

Sizes and Specifications other than above can be manufactured on request

Chemical Composition of Stainless Steel 321/321H Seamless Pipes And Tubes

%	Cr	Ni	C	Si	Mn	P	S	N	Ti	Fe
321	min:17.0 max:19.0	min: 9.0 max:12.0	max:0.08	max:0.75	max:2.0	max:0.045	max:0.03	max:0.10	min:5*(C+N) max:0.70	Balance
321H	min:17.0 max:19.0	min: 9.0 max:12.0	min:0.04 max:0.10	min:18.0 max:20.0	max:2.0	max:0.045	max:0.03	max:0.10	min:5*(C+N) max:0.70	Balance