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ASTM A312 TP347H Cold-Drawn Polished Stainless Steel Seamless Pipe for High Temperature Applications

Minimum Order Quantity	50 kg
Price	US $4.85-7.25 / kg

Product Details

Model NO.	347H	Shape	Round
Technique	Cold-Drawing	Surface Treatment	Polished
Specification	OD 6-630mm	Outside Diameter	1/2"-24"
Thickness	SCH5 SCH10 SCH40 SCH80 SCH160 XXS	Material Grade	Incone 904L, 254MO, 317L
Standard	ASTM A312, A269	Length Tolerance	+/- 5mm
Outer Diameter Tolerance	+/- 0.2mm	Thickness Tolerance	+/- 0.02mm
Density	7.96 G/cm3	Melting Range	1398 - 1446°C
Thermal Conductivity	16.3 W/m-°K
Highlight	ASTM A312 Stainless Steel Pipe , Cold-Drawing Technique Seamless Pipe , Polished Surface 347H Stainless Steel Pipe

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Product Description

ASTM A312 TP347 / 347H Stainless Steel Seamless Pipe

Product Specifications

Product Name	347H Stainless Steel Seamless Pipe
Shape	Round
Outside Diameter	1/2" - 24"
Thickness	SCH5, SCH10, SCH40, SCH80, SCH160, XXS
Material Grade	Special steel: Incone 904L, 254MO, 317L and similar alloys
Raw Material	Tsing Shan
Standard	ASTM A312, A269
Length	Customized to customer requirements
Tolerance	Outer Diameter: ±0.2mm, Thickness: ±0.02mm, Length: ±5mm
Surface Treatment	Annealing, pickling, sandblasting
Marking	LOGO, SIZE, STANDARD, HEAT TREATMENT, Custom markings available
Quality Assurance	Dedicated inspection team, strict standards, accepts third-party inspection
Applications	Industrial, exhaust systems, water, petroleum, chemical, nuclear, power generation, shipbuilding, paper making, food processing, decoration, machinery and construction
Testing	Squash test, extended test, water pressure test, heat treatment, NDT
Delivery	Large raw material stock ensures timely order completion

Alloy 347/347H Overview

Alloy 347 (S34700) is a stabilized stainless steel that provides excellent resistance to intergranular corrosion after exposure to temperatures between 800°F to 1500°F (427°C to 816°C). The alloy is stabilized by columbium and tantalum additions.

Alloy 347H stainless steel offers enhanced creep resistance and higher strength at temperatures above 1000°F (537°C) due to its higher carbon content (0.04-0.10).

Key Properties

General Characteristics

Columbium-stabilized austenitic stainless steel
Excellent intergranular corrosion resistance
Good oxidation resistance and creep strength up to 1500°F (816°C)
Enhanced performance in strongly oxidizing environments
Good low-temperature toughness
Cannot be hardened by heat treatment, only by cold working

Corrosion Resistance

Superior to Alloy 321 in strongly oxidizing environments up to 1500°F (816°C)
Suitable for nitric solutions and diluted organic acids
Resists polythionic acid stress corrosion cracking in hydrocarbon service
Not recommended for chloride solutions or sulfuric acid applications

Chemical Composition

Element	347	347H
Chromium	17.00-19.00%	17.00-19.00%
Nickel	9.00-13.00%	9.00-13.00%
Carbon	0.08% max	0.04-0.10%
Manganese	2.00% max	2.00% max
Phosphorus	0.045% max	0.045% max
Sulfur	0.03% max	0.03% max
Silicon	0.75% max	0.75% max
Columbium & Tantalum	10×(C+N) min - 1.00% max	8×(C+N) min - 1.00% max
Iron	Balance

Physical Properties

Density	0.288 lbs/in³ (7.96 g/cm³)
Specific Heat	0.12 BTU/lb-°F (500 J/kg-°K)
Modulus of Elasticity	28.0 × 10⁶ psi (193 GPa)
Thermal Conductivity	133 BTU/hr/ft²/ft/°F (16.3 W/m-°K)
Melting Range	2550-2635°F (1398-1446°C)
Electrical Resistivity	72 Microhm-cm at 20°F

Thermal Expansion Coefficients

Temperature Range	°F/°F	cm/cm°C
68-212°F (20-100°C)	9.2 × 10⁻⁶	16.0 × 10⁻⁶
68-1112°F (20-600°C)	10.5 × 10⁻⁶	18.9 × 10⁻⁶
68-1832°F (20-1000°C)	11.4 × 10⁻⁶	20.5 × 10⁻⁶