Stainless Steel 321 / 321H Buttweld Fittings

Teerasil Fittings and Plates, a trusted manufacturer and supplier based in Bangkok, Thailand, specializes in top-notch Stainless Steel 321 / 321H Buttweld Fittings. These fittings are crafted to excel in high-temperature and corrosive settings. SS 321 is a titanium-stabilized austenitic stainless steel that stands out for its resistance to intergranular corrosion, while SS 321H, with its higher carbon content, offers improved strength and creep resistance when the heat is on. Built to meet international standards, our buttweld fittings promise precision, durability, and leak-proof connections. They’re widely used in industries like oil & gas, chemical, petrochemical, power generation, and heat treatment, ensuring that Teerasil delivers dependable solutions for even the most demanding piping systems.

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Stainless Steel 321 / 321H Buttweld Fittings Specification

Specifications	ASME SA403 / ASTM A403
Dimension Standard	ASME/ANSI B16.9, MSS-SP-43/SP-79, ASME B16.28, ASME B16.25, ASME B16.49
Standard Size Range	1/2” NB TO 48” NB. (Fabricated, Seamless and 100% X-Ray Welded)
Manufacturing Type	Fabricated / Seamless / Welded / ERW
Bending Radius	R=1D, 2D, 3D, 5D, 6D, 8D, 10D, or Custom
Wall Thickness / Schedule	SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS / 3mm – 40mm
End Connection	Butt Weld
Melting Point	1400-1450°C for (WP321)
Outside Diameter (OD)	Seamless / Buttweld Fitting ( 1/2″～48″), ERW / Welded / Fabricated Buttweld Fitting (1/2″～48″)
Value Added Services	Hot Dipped Galvanizing, Electro Polish, Sand Blasting, Epoxy & FBE Coating, Threading, Soldering
Other Standards	MSS SP-75, ISO, SNSI, JIS, DIN, GB, DIN2617, JISB2311, JISB2312, JISB2313 / T12459GB / T13401, SH3408, SH3409HG / T21635HG / T21631SY / T05010
Material Test Certificates (MTC)	As per EN 10204 3.2 and EN 10204 3.1, Certifying NACE MR0175, NACE MR0103
Materials	AISI 321
Two Halve / Two Joint Buttweld Fittings Size	6″ to 48″
Manufacturing Specification	ASME: ANSI B16.9, ANSI B16.28, ASME B16.25, MSS-SP-43, DIN: DIN2605, DIN2615, DIN2616, DIN2617, DIN28011, EN: EN10253-1, EN10253-2
A403 SS Seamless Fittings	Size: 15 NB to 300 NB \| Sch.& Swg: Sch.5 to Sch.XXs
A403 SS Welded Fittings	Size: 15 NB to 600 NB \| Sch.& Swg: Sch.5 to Sch.80s

Stainless Steel 321 / 321H Buttweld Fittings are made up of iron, 17–19% chromium, 9–12% nickel, and titanium for stabilization. The 321H variant features a higher carbon content, which enhances its strength at high temperatures and improves creep resistance. Both grades are known for their excellent resistance to oxidation and intergranular corrosion. In terms of mechanical properties, they offer a tensile strength of around 515 MPa, a yield strength of about 205 MPa, and good elongation, remaining stable up to 870°C. These fittings are tough, durable, and resistant to stress rupture, making them perfect for high-pressure and high-temperature applications in industrial piping systems.

Stainless Steel 321 / 321H Buttweld Fittings Chemical Composition

Grade	C	Mn	Si	P	S	Cr	N	Ni	Ti
SS 321	0.08 max	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	5(C+N) – 0.70 max
SS 321H	0.04 – 0.10	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	4(C+N) – 0.70 max

Stainless Steel 321 / 321H Buttweld Fittings Mechanical Properties

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1457 °C (2650 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

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Largest Stainless Steel 321 / 321H Buttweld Fittings Supplier in Bangkok, Thailand

Teerasil Fittings is a leading supplier of Stainless Steel 321 Buttweld Fittings in Bangkok, Thailand. We offer an extensive range of Stainless Steel 321H Buttweld Fittings, renowned for their excellent corrosion resistance and high strength, which makes them perfect for demanding industrial applications like chemical processing, marine environments, and high-temperature systems. With a commitment to quality and reliable delivery, we ensure our clients receive top-tier products tailored to meet the specific needs of various industries.

We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.

If You Are Looking To Buy High Quality

Stainless Steel 321 / 321H Buttweld Fittings Equivalent Grade

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

Why Choose Stainless Steel 321 / 321H Buttweld Fittings from Teerasil Fittings?

Stainless Steel 321 Buttweld Fittings from Teerasil Fittings offer exceptional corrosion resistance, especially in seawater and harsh environments. They are known for their high strength, durability, and resistance to pitting and crevice corrosion, ensuring long-lasting performance. We provide precise manufacturing, quality control, and reliable service for diverse industrial applications.

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Stainless steel 321/321H Buttweld Fittings provide excellent resistance to intergranular corrosion, making them ideal for high temperature applications. Their titanium stabilizer ensures excellent strength and durability even in extreme temperatures. The fittings are resistant to oxidation and scaling, maintaining structural integrity at elevated temperatures. Weldability and flexible formability make them suitable for complex piping systems. Their improved creep and stress breakdown properties ensure reliability in harsh environments. Furthermore, these materials are low cost, require little maintenance, and are versatile in the chemical, petrol and power industries.

Types of Stainless Steel 321 / 321H Buttweld Fittings

Stainless Steel 321 / 321H Buttweld Fittings Dimensions Chart

Nominal Pipe Size (inches)	Outside Diameter		45°Elbows		90° Elbows		180° Returns
	Outside Diameter		Long Radius		Long Radius	Short Radius	Long Radius
	(mm)	(inches)	Center to Face (inches)	Radius (inches)	Center to Face (inches)	Center to Face (inches)	Center to Center (inches)	Back to face (inches)
1	33.4	1.315	7/8		1 1/2	1	3	2 3/16
1/2	21.3	0.840	5/8		1 1/2	–	2	1 7/8
3/4	26.7	1.050	7/16		1 1/8	–	2 1/4	1 11/16
1 1/4	42.2	1.660	1		1 7/8	1 1/4	3 3/4	2 3/4
1 1/2	48.3	1.900	1 1/8	3	2 1/4	1 1/2	4 1/2	3 1/4
2	60.3	2.375	1 3/8	4	3	2	6	4 3/16
2 1/2	73.0	2.875	1 3/4	5	3 3/4	2 1/2	7 1/2	5 3/16
3	88.9	3.500	2	6	4 1/2	3	9	6 1/4
3 1/2	101.6	4.000	2 1/4	7	5 1/4	3 1/2	10 1/2	7 1/4
4	114.3	4.500	2 1/2	8	6	4	12	8 1/4
5	141.3	5.563	3 1/8	10	7 1/2	5	15	10 5/16
6	168.3	6.625	3 3/4	12	9	6	18	12 5/16
8	219.1	8.625	5	12	12	8	24	16 5/16
10	273.1	10.750	6 1/4	15	15	10	30	20 3/8
12	323.9	12.750	7 1/2	18	18	12	36	24 3/8

Are Custom Sizes Available for Stainless Steel 321 / 321H Buttweld Fittings?

Yes, custom sizes for Stainless Steel 321 / 321H Buttweld Fittings are available at Teerasil Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@teerasilfittings.com.

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Application Industry of Stainless Steel 321 / 321H Buttweld Fittings

Stainless Steel 321 and 321H Buttweld Fittings are a go-to choice in industries that demand strength, corrosion resistance, and durability, especially at high temperatures. You’ll often find them in exhaust manifolds, refinery equipment, heat exchangers, pressure vessels, and chemical processing systems. Power generation plants utilize these fittings in boilers and superheaters, while the oil and gas industry counts on them for pipelines that handle corrosive fluids. The higher carbon content in SS 321H makes it an excellent option for high-temperature applications. With their impressive resistance to scaling, oxidation, and stress corrosion cracking, these fittings promise a long service life, making them essential for critical piping needs across various industries.