What Is A182 F347H Material?

What is A182 material?

ASTM A182 is a standard specification for forged or rolled alloy and stainless steel components like flanges, fittings, and valves used for high-temperature service. The specific material properties depend on the designated grade, such as F11 (a low alloy steel) or F51 (a duplex stainless steel), with each grade having a specific chemical composition and mechanical properties.

 

What is A182 F347H material?

ASTM A182 F347H is a heat-resistant stainless steel used for forged flanges and fittings in high-temperature, high-pressure piping systems. Belonging to the 347H series, it contains the stabilizing element niobium (Nb), providing excellent resistance to intergranular corrosion and high-temperature creep rupture. It is commonly used in demanding environments such as petrochemical and power generation industries.

 

GNEE is an experienced manufacturer of ASTM A182 F347 stainless steel flanges. We offer a wide range of ANSI B16.5 F347/F347H flanges, such as SS DIN 1.4550 slip-on flanges, 347H SS weld neck flanges, stainless steel ASTM A182 347 socket weld flanges, B16.47 347 orifice flanges, ASME B16.48 347 blind flanges, A182 F347H spectacle blind flanges, Grade 347 stainless steel threaded flanges, EN 1092-1 347 reducing flanges, SS 347H ring type joint (RTJ) flanges, etc.

ASME SA182 F347/F347H Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	JIS	GOST	EN
SS 347	1.4550	S34700	SUS 347	08Ch18N12B	X6CrNiNb18-10
SS 347H	1.4961	S34709	SUS 347H	–	X6CrNiNb18-12

 

ASME SA182 F347H Flange Chemical Composition

Grade	Si	P	S	Ni	Fe	C	Mn	Cr	Cb
SS 347	1.0 max	0.045 max	0.030 max	9.00 – 13.00	62.74 min	0.08 max	2.0 max	17.00 – 20.00	10xC – 1.10
SS 347H	1.0 max	0.045 max	0.030 max	9.0 -13.0	63.72 min	0.04 – 0.10	2.0 max	17.00 – 19.00	8xC – 1.10

 

ASTM A182 SS 347 Flanges Mechanical Properties

Tensile Strength	Yield Strength (0.2%Offset)	Density	Melting Point	Elongation
Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	8.0 g/cm3	1454 °C (2650 °F)	35 %

 

ASTM A182 F347/F347H Flange Standards 

ASME/ANSI B 16.5	Blind Flange, High Hub Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Ring Type Joint Flange, Lap Joint Flange, Threaded Flange
PRESSURE CLASS	150, 300, 400, 600, 900, 1500, 2500
ASME/ANSI B 16.47	Blind Flange [Series A & B],Welding Neck Flange
PRESSURE CLASS	75, 150, 300, 400, 600, 900
ASME/ANSI B 16.36	Slip on Flange, Threaded Flange, Welding Neck Flange,
PRESSURE CLASS	300, 400, 600, 900, 1500, 2500
BS 4504 SEC 3.1	Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange,
PRESSURE CLASS	PN 2.5 TO PN 40

 

347/347H Stainless Steel Flange Price List
ASTM A182 F347H Stainless Steel Flange, 3/4 NPT Pipe Size (In.): $40.25 / pkg.
Stainless Steel 347 Pipe Flange, 1 NPT Pipe Size (In.): $35.10 / pkg.
347/347H Stainless Steel Flange, 1 NPT Pipe Size (In.): $35.40 / pkg.
347H Stainless Steel Flange, 1-1/2 NPT Pipe Size (In.): $28.00 / pkg. 

 

Gnee supplies A182 F347H stainless steel flanges in a full range of types, sizes, and pressure ratings, meeting international standards such as ASME B16.5, B16.47, and EN equivalents. Our offerings include weld neck, slip-on, blind, threaded, socket weld, and lap joint flanges, with diameters from DN15 up to DN1200 and pressure classes from 150 lb to 2500 lb.

Full certification, including EN 10204 3.1/3.2 MTC, PMI material verification, and third-party inspection by SGS, BV, or TUV

Packaging & Delivery: Export-ready wooden pallets, waterproof wrapping, and sea-worthy crates ensure safe shipment. Lead times for stocked items are typically 7–15 days, with support for custom orders and bulk projects.