Stainless Steel 347 / 347H Flanges Manufacturer, Supplier, and Stockists in India

Samay Steel and Engineering Co. is a trusted manufacturer, stockist, and exporter of top-grade Stainless Steel 347 / 347H Flanges, offering reliable solutions for high-temperature and pressure environments. Stainless Steel 347 is a columbium-stabilized austenitic stainless steel, which provides excellent resistance to intergranular corrosion after exposure to high temperatures. Stainless Steel 347H is the high-carbon variant, designed for enhanced creep resistance and higher strength at elevated temperatures, making both grades suitable for heat exchangers, boilers, and other thermal processing equipment.

The company supplies a comprehensive range of Stainless Steel 347 / 347H Flanges, including weld neck, slip-on, socket weld, blind, threaded, and lap joint flanges. All flanges are manufactured in accordance with international standards such as ASTM A182 and ASME B16.5, ensuring dimensional precision, high mechanical strength, and long service life. These flanges are ideal for demanding applications in industries such as petrochemical, refinery, aerospace, and power generation, where both corrosion resistance and heat tolerance are essential.

As a leading stockist, Samay Steel and Engineering Co. maintains a ready inventory of Stainless Steel 347 / 347H Flanges in various pressure classes (150#, 300#, 600#, etc.), sizes, and face types such as Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ). Each flange undergoes strict quality control processes including PMI testing, pressure testing, and dimensional inspection to meet customer-specific and global quality standards. Their in-house production capabilities ensure that both standard and custom requirements are met with efficiency.

Samay Steel and Engineering Co. exports its Stainless Steel 347 / 347H Flanges to a wide range of international markets, including Oman, Qatar, Saudi Arabia, UAE, and Kuwait in the Middle East; Spain and Germany in Europe; the USA and Canada in North America; as well as several industrial regions across Africa. With reliable global logistics and a strong distribution network, the company ensures timely delivery and comprehensive export documentation, earning the trust of engineering firms and contractors worldwide.

Stainless Steel 347 / 347H FlangesP Specifications

Backed by extensive industry experience, Samay Steel and Engineering Co. continues to deliver superior Stainless Steel 347 / 347H Flanges that meet the technical and operational needs of complex projects. Their focus on quality, innovation, and customer satisfaction has positioned them as a preferred supplier of stainless steel flange solutions globally. Whether for high-temperature process systems or corrosive environments, their products offer durability, performance, and long-term reliability.

Whether for high-pressure applications or environments requiring superior corrosion resistance, Stainless Steel 347 / 347H Flanges from Samay Steel and Engineering Co. offers the reliability, performance, and global supply chain support needed to meet demanding industrial needs worldwide.

Chemical Composition of Stainless Steel 347 / 347H Flanges

Specification	Details
Grades	Stainless Steel 347 / 347H
UNS Number	S34700 / S34709
Standards	ASTM A312, A213, A269, A358, A249
Form	Seamless, Welded, ERW, Fabricated
Pipe & Tube Size Range	1/8” NB to 24” NB (for pipes), 6.35 mm OD to 101.6 mm OD (for tubes)
Thickness	0.5 mm to 20 mm
Length	Single Random, Double Random & Cut Length
Schedules (Wall Thickness)	SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, XXS
Type	Round, Square, Rectangular
Finish	Annealed & Pickled, Bright Annealed, Polished
End Types	Plain End, Beveled End, Threaded
Manufacturing Process	Cold Drawn, Hot Finished, Welded
Testing & Certification	PMI Test, Hydro Test, Third Party Inspection, Mill Test Certificates (MTC)
Applications	Heat exchangers, Power plants, Petrochemicals, Refineries, Aerospace

Element	SS 347 (% by weight)	SS 347H (% by weight)
Carbon (C)	≤ 0.08	0.04 – 0.10
Manganese (Mn)	≤ 2.00	≤ 2.00
Phosphorus (P)	≤ 0.045	≤ 0.045
Sulfur (S)	≤ 0.030	≤ 0.030
Silicon (Si)	≤ 1.00	≤ 1.00
Chromium (Cr)	17.0 – 19.0	17.0 – 19.0
Nickel (Ni)	9.0 – 13.0	9.0 – 13.0
Niobium (Cb/Nb)	≥ 10 x C (min 0.30%)	≥ 10 x C (min 0.30%)
Iron (Fe)	Balance	Balance

Mechanical Properties of Stainless Steel 347 / 347H Flanges

Property	Stainless Steel 347	Stainless Steel 347H
Tensile Strength (min)	515 MPa (75 ksi)	515 MPa (75 ksi)
Yield Strength (min)	205 MPa (30 ksi)	205 MPa (30 ksi)
Elongation (min)	35%	35%
Hardness (max)	95 HRB	95 HRB
Modulus of Elasticity	~193 GPa	~193 GPa
Melting Range	1398 – 1446°C	1398 – 1446°C
Density	7.96 g/cm³	7.96 g/cm³
Impact Strength	Good	Good

Types of Pipes and Tubes

Cities we supply Pipes & Tubes in India :-

Countries we export Pipes & Tubes worldwide :-