Stainless Steel 321 and 321H Welded Pipes

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Stainless Steel 321 and 321H Welded Pipes Manufacturer, Supplier and Exporter in Kuala lumpur, Malaysia

**Maria Pipes and Tubes**, based in Kuala Lumpur, Malaysia, stands out as a top manufacturer and supplier of **Stainless Steel 321 and 321H Welded Pipes**. They provide high-quality piping solutions specifically designed for high-temperature and corrosive environments. By employing cutting-edge welding technology and strict quality control measures, the company guarantees that its 321/321H welded pipes comply with ASTM A312 / ASME SA312 standards. These pipes come in a variety of sizes—from ½” to 24″ nominal bore—and schedule thicknesses ranging from SCH 5 to SCH 160, available in different shapes (round, square, rectangular) and finishes to meet various industrial requirements ([Newzel Industries][1], [Ranflex Metals][2]).

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**Stainless Steel 321 and 321H** are austenitic stainless steels that are stabilized with titanium. The 321 grade limits carbon content to a maximum of 0.08%, while 321H has a higher carbon range (0.04–0.10%), which improves its resistance to creep at elevated temperatures ([Vardhman Tube][3], [Jyoti Metal][4], [Continental Steel & Tube Company][5]). Both grades feature 17–19% chromium, 9–12% nickel, and enough titanium to prevent carbide precipitation ([Vardhman Tube][3], [Unifit Metalloys][6]). The welded pipes boast a minimum tensile strength of approximately 515 MPa, a yield strength of around 205 MPa, and an elongation of 35–40% ([Vardhman Tube][3], [Unifit Metalloys][6], [Mahaveer Steel][7]).

Stainless Steel 321 and 321H Welded Pipes Specification

Specifications : ASTM A312 / ASME SA312

Outside Diameter : 6.00 mm OD up to 914.4 mm OD, Sizes up to 24″ NB available Ex-stock, OD Size available Ex-stock

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

Size : 1/2″ NB – 24″ NB

Type : Welded

Form: Round Pipes, Square Pipes, Rectangular Pipes.

Length : Single Random, Double Random & Required Length

End : Plain End, Beveled End, Treaded

Equivalent Grades for Stainless Steel 321 and 321H Welded Pipes

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

321 and 321H Stainless Steel Welded Pipes 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

SS 321 and 321H Welded Pipes 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 %

If You Are Looking To Buy High Quality

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

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Why Choose 321 and 321H Stainless Steel Welded Pipes from Maria Pipes and Tubes?

Choosing Stainless Steel 321 and 321H Welded Pipes guarantees excellent corrosion resistance, high strength, and durability. Designed for diverse industrial applications, it delivers reliable performance in tough environments while maintaining competitive pricing for cost-effective solutions.

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Largest 321 and 321H Stainless Steel Welded Pipes Supplier in Kuala lumpur, Malaysia

**Applications** for Stainless Steel 321/321H Welded Pipes are extensive across various industries. Their ability to resist high-temperature corrosion, stress rupture, and thermal creep makes them ideal for use in chemical and petrochemical plants, aerospace, power generation, food processing, offshore platforms, heat exchangers, and pharmaceutical systems ([Meta Aerospaces][8], [Jaydeep Steels][9]). The 321H grade, with its elevated carbon content, offers enhanced mechanical strength and stability in high-temperature settings ([Jyoti Metal][4], [Co].

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321 and 321H Stainless Steel Welded Pipe Sizes

NB Sizes	Sch 5	Sch 10	Sch 40	Sch 80	Sch 160
1/8″	✓	✓	✓	✓
1/4″	✓	✓	✓	✓
3/8″	✓	✓	✓	✓
1/2″	✓	✓	✓	✓	✓
3/4″	✓	✓	✓	✓	✓
1″	✓	✓	✓	✓	✓
1 1/4″	✓	✓	✓	✓	✓
1 1/2″	✓	✓	✓	✓	✓
2″	✓	✓	✓	✓	✓
2 1/2″	✓	✓	✓	✓	✓
3″	✓	✓	✓	✓	✓
4″	✓	✓	✓	✓	✓
5″	✓	✓	✓	✓
6″	✓	✓	✓	✓

Physical Properties of SS 321 and 321H Welded Pipes

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
321 and 321H	8027	193	16.6	17.2	18.6	16.1	22.2	500	720

Types of 321 and 321H Stainless Steel Welded Pipes

Are Custom Sizes Available for 321 and 321H Stainless Steel Welded Pipes?

We offer custom sizes for Stainless Steel 321 and 321H Welded Pipes to meet your specific needs. Our dedicated team at Maria Pipes and Tubes provides tailored solutions for all your piping and tubing requirements. For more information, contact us at sales@mariapipes.com.

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Stainless Steel 321 and 321H Welded Pipes are widely used in a variety of industries due to their superior thermal properties and corrosion resistance The most common applications are the pharmaceutical, oil and gas production, and petrochemical industries, where they use to transport water and air. Intergranular corrosion resistance makes them suitable for high stress environments, such as aircraft exhaust systems, heat exchangers and pressure vessels In addition, these pipes are ideal for power generation and marine applications, ensuring reliability and durability prolong in a difficult situation.