Stainless Steel 347 Pipes | Stainless Steel 347H Pipes

Stainless Steel 347 / 347H Pipes

Designed particularly to offer exceptional resistance to intergranular corrosion and to run reliably at high temperatures, advanced austenitic stainless steel grades Stainless Steel 347 and 347H are stabilised with columbium (niobium). Under demanding industrial circumstances like high heat, powerful chemicals, and higher pressure, these grades excel. Over lengthy service life, the stabilisation technique maintains material mechanical integrity and corrosion resistance by preventing chromium carbide precipitation. Because of their mechanical strength and thermal stability, industries including aerospace, petrochemical, chemical processing, power generation, and oil & gas sectors highly value SS 347 and SS 347H pipes.

What is Stainless Steel 347?

While columbium-stabilized alloy Stainless Steel 347 resists intergranular corrosion even in this range, carbide precipitation typically occurs in a range between 800–1500°F (427–816°C). SS 347 is hence a consistent choice for extended operation in high-heat conditions. Strong creep resistance and stress rupture characteristics find great application in heat exchangers, chemical tanks, furnace components, and other high-temperature process equipment where prolonged thermal exposure is common.

What is Stainless Steel 347H?

Excellent creep resistance and high-temperature strength have been added by the high-carbon form of SS 347, Stainless Steel 347H. With a carbon concentration between 0.04% and 0.10%, SS 347H is particularly suitable for pressure-containing machinery and components functioning in conditions exceeding 1000°F (538°C). Where improved mechanical strength determines long-term performance, the selected material for high-pressure boilers, pressure vessels, superheaters, and radiant heat applications is this one.

Offered features on the pipes are High end finishing, accurate dimensions, high durability and timely delivery are some of the valuable services offered by them. Moreover, the industry uses modern machinery and other latest technology in order to enhance the productivity. Talking about the material testing, the industry professional conducts several material tests in order to ensure the quality and efficiency before finally delivering it to the customers. hardness test, PMI test, IGC test, pitting resistance test, longitudinal test, flattening test, flaring test, micro and macro test, chemical analysis and bend tests are some of the material tests. The industry is engaged in offering SS 347/347H Welded Pipes to the buyers along with the relevant documents. Offered documents are QAP, material traceability record, guarantee letter, material tests certificates, laboratory test reports approved by NABL, welding procedure specification, heat treatment chart, packaging list that contains the net and the gross weight and commercial invoice are some of the documents offered.

Specifications of Stainless Steel 347 / 347H Pipes

Specification

Specifications

ASTM A312, A358 / ASME SA312, SA358

Dimensions

ASTM, ASME and API

Seamless Pipe Size

1/2″ NB – 16″NB

ERW Pipe Size

1/2″ NB – 24″ NB

EFW Pipe Size :

6″ NB – 100″ NB

Outside Diameter :

6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available

Length

Single Random, Double Random & Required Length

Thickness

0.3mm – 50 mm

Schedule

SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS

Type

Seamless, Welded, ERW, EFW

Form

Round Pipes, Square Pipes, Rectangular Pipe

End

Plain End, Beveled End, Treaded

Stainless Steel 347/347H Pipes Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	JIS	GOST	EN
SS 347	1.4550	S34700	SUS 347	08Ch18N12B	X6CrNiNb18-10
SS 347H	1.4878	S34709	SUS 347H	-	X6CrNiNb18-12

SS 347/347H Pipes Chemical Composition

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

Stainless Steel 347/347H Pipes Mechanical & Physical Properties

Element	SS 347	SS 347H
Density	8.0 g/cm3	8.0 g/cm3
Melting Point	1454 °C (2650 °F)	1454 °C (2650 °F)
Tensile Strength	Psi – 75000 , MPa – 515	Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset)	Psi – 30000 , MPa – 205	Psi – 30000 , MPa – 205
Elongation	35 %	35 %

Applications of Stainless Steel 347 / 347H Pipes

Heat Exchangers & Steam Boilers
Oil & Gas Transmission and Refining Units
Petrochemical and Chemical Processing Plants
Power Generation and Nuclear Facilities
Pharmaceutical & Hygienic Processing Equipment
Aerospace & Aircraft Exhaust Systems
Furnace Parts and Superheater Tubes

Advantages of Using SS 347 / 347H Pipes

Resistance to chromium carbide formation during welding processes
Long service life in oxidizing, acidic, or high-heat environments
No need for post-weld heat treatment, reducing fabrication time and cost
Enhanced durability and structural reliability under thermal stress
Minimal maintenance and superior life-cycle cost efficiency

Where to Buy Stainless Steel 347 / 347H Pipes?

Globally known supplier and exporter of superior Stainless Steel 347 and 347H pipes is Solitaire Overseas. Designed to satisfy strict international requirements, our inventory consists in a variety of seamless and welded pipes & tubes. Every pipe is checked rigorously for dimensional accuracy, corrosion prevention, and pressure resistance. For SS 347/347H pipe solutions across all industry, Solitaire Overseas is your dependable partner with worldwide delivery capabilities and a dedication to client satisfaction.