Stainless Steel 304H Heat Exchanger Tubes Manufacturer and Supplier

Stainless Steel 304H heat exchanger tubes are austenitic tubes manufactured to ASTM A213 / ASME SA-213 (seamless) and ASTM A249 / ASME SA-249 (welded) specifications. The TP304H designation carries a controlled carbon range of 0.04–0.10%, which is higher than standard 304 (0.08% max) and 304L (0.030% max). The higher carbon content gives the steel excellent strength at temperatures above 500°C.

SS 304H heat exchanger tubes have 18.0–20.0% chromium and 8.0–11.0% nickel, which helps them resist oxidation (rusting and scaling) in continuous use up to 920°C. Minimum tensile strength is 75 ksi (515 MPa), yield strength is 30 ksi (205 MPa), and elongation at 35%.

Sachiya Steel International is an ISO 9001, 14001, and 45001 certified company in Mumbai, India. We have over 2 decades of experience as a manufacturer, supplier, stockist, and exporter of SS 304H heat exchanger tubes for customers worldwide. Tubes are available in outer diameters from 6.35 mm to 101.60 mm, wall thicknesses from 0.70 mm to 8.00 mm, and lengths up to 20 metres.

We stock seamless, welded, U-bend, and finned tube forms for petroleum refining, power generation, chemical processing, and boiler system applications. Every tube ships with mill test certificates (MTC 3.1), and third-party inspection is available on request.

This page covers:

Specifications
Pricing
Chemical Composition
Mechanical Properties
Applicable Specifications
Equivalent Designations
Industrial Applications
304H vs 304L Comparison
Frequently Asked Questions

Stainless Steel 304H Heat Exchanger Tubes Specifications

The specifications for the SS 304H Heat Exchanger Tube, including sizes, surface finish and standards, are listed below in the table:

Parameter	Details
Standards	ASTM A213 / ASME SA213 (Seamless Ferritic & Austenitic Alloy Steel Boiler, Superheater, and Heat Exchanger Tubes); ASTM A269 (General Service Tubes); ASTM A249 (Welded Heat Exchanger Tubes)
Size Range	OD: 6.0 mm to 101.6 mm (1/4" to 4")
Wall Thickness	0.5 mm to 12.7 mm (depending on OD and manufacturing method)
Length	Up to 6 metres standard; custom lengths up to 12-18 metres (U-bent tubes also available)
End Type	Plain End (PE), Bevelled End (BE), U-Bent, Square Cut, Annealed & Pickled ends
Surface Finish	Annealed & Pickled (AP), Bright Annealed (BA), Polished (OD/ID as required)
Form	Seamless, Welded, U-Tubes, Straight Lengths

Available Sizes of 304H Heat Exchanger Tubes

The availability of sizes for the SS 304 Heat Exchanger Tubes is mentioned in the table below:

Parameter	Specification
Material Grade	Stainless Steel 304H
Outer Diameter (OD)	6.35 mm to 101.60 mm
Wall Thickness	0.70 mm to 8.00 mm
Length	Up to 20 metres (65.62 ft)
Sizing Options	Standard and custom sizes available

Standard Tube Dimensions

The standard tube dimensions for the SS 304 Heat Exchanger Tubes are mentioned in the table below:

Parameter	Details
Common OD Range (304H Service)	9.52 mm to 50.80 mm
Condenser Tube OD Range	10 mm to 50.8 mm
Outer Diameter Tolerance	±0.05 mm

Custom Sizes and Cut-to-Length

Sachiya Steel International supplies custom-cut 304H tubes as per the client's specification. U-bend radii start from 1.25 × OD, with tube lengths available up to 1,700 mm bend radius for large exchangers. Contact us with your heat exchanger design drawings for exact fabrication requirements.

Stainless Steel 304H Heat Exchanger Tubes Price

Stainless Steel 304H heat exchanger tubes range between ₹250 and ₹468 per kilogram and US $3.50–5.28 per kilogram or US $5–20 per metre. Per-ton pricing falls between US $1,000 and $6,000. Final cost depends on outer diameter, wall thickness, length, quantity, finish (AP, BA, polished), and whether the tube is seamless or welded. Raw material price fluctuations also affect quoted rates. Contact Sachiya Steel International for your project requirements.

Chemical Composition of Stainless Steel 304H Heat Exchanger Tubes

The chemical composition of SS 304H Heat Exchanger Tubes, along with their proportions, is listed in the table below.
The controlled carbon range of 0.04–0.10% is what defines 304H against other 304 variants. It strengthens grain boundaries under sustained thermal loads, reducing the risk of intergranular cracking during long-term high-temperature service.

Carbon C

0.04 - 0.10%

Manganese Mn

2.00% max

Phosphorus P

0.045% max

Sulfur S

0.030% max

Silicon Si

1.00% max

Chromium Cr

18.0 - 20.0%

Nickel Ni

8.0 - 11.0%

Mechanical Properties of ASTM A213 TP304H Tubes

The mechanical properties of SS 304H Heat Exchanger Tubes, including elongation and tensile strength, are listed below.
A 35% minimum elongation shows that 304H is still flexible enough for cold forming, including U-bending.

75 / 515

ksi / MPa (min)

Tensile Strength

30 / 205

ksi / MPa (min)

Yield Strength

35%

(min)

Elongation

Property	Value
Tensile Strength (min)	75 ksi / 515 MPa
Yield Strength (min)	30 ksi / 205 MPa
Elongation (min)	35%

Equivalent Designation of Stainless Steel 304H Heat Exchanger Tubes

International designation equivalent to Stainless Steel 304H Heat Exchanger Tubes, along with UNS and Werkstoff Nr., is listed below:

Standard / System	Designation
UNS	S30409
EN	X6CrNi18-10
ISO	ISO 9329-2 X6CrNi18-10
Werkstoff (Germany)	1.4948
JIS (Japan)	SUS 304H
BS (UK)	304S51

Request a Quote for ASTM A213 TP304H Heat Exchanger Tubes Request a Quote

Industrial Applications of 304H Heat Exchanger Tubes

304H heat exchanger tubes are found in industries where sustained high-temperature exposure demands excellent creep resistance.

Oil Refining and Petrochemical Processing

Used in high‑temperature refinery units like crude distillation columns, catalytic reformers, and hydrocrackers.

Power Generation and Boiler Systems

They serve in coal and gas‑fired power plants for superheaters and economisers.

Chemical Processing

304H large diameter tubes are chosen for reactor exchangers, acid recovery, and fertiliser plants.

304H vs 304L Heat Exchanger Tubes: Which to Choose

The carbon content is the main differentiator between 304H and 304L Heat Exchanger Tubes. The table given below explains it in detail.

Parameter	Stainless Steel 304H	Stainless Steel 304L
Carbon Content	0.04-0.10%	≤ 0.030%
Primary Advantage	Superior creep strength	Reduced sensitisation risk
Temperature Range	Suitable for continuous service above 500°C	Best for service below 425°C
Corrosion Resistance	Moderate (less resistant to intergranular corrosion)	Excellent resistance to intergranular corrosion
Key Property Focus	High-temperature strength	Corrosion resistance in aqueous media
Typical Applications	Heat exchangers in refineries, power plants, and thermal processing systems	Chemical storage, food processing, and pharmaceutical equipment
Material Selection Basis	High-temperature performance	Corrosive environments at lower temperatures

Shipping & Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect SS 304H heat exchanger tubes from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

Heavy-duty wooden boxes with moisture barrier lining
HDPE stretch film wrapping on all bundles
Plastic end caps on threaded and plain-end pipes
Silica gel desiccants to minimize moisture exposure
ISPM-15 fumigated wooden packaging for export

Pipe Bundle Yard Staging

Container End-Cap Protection

Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

USA
Canada

Frequently Asked Questions:

What Sizes are available for SS 304H Heat Exchanger Tubes? +

SS 304H heat exchanger tubes are available in outer diameters from 6.35 mm to 101.60 mm, wall thicknesses from 0.70 mm to 8.00 mm, and lengths up to 20 metres. Custom-cut lengths and U-bend configurations are also supplied.

What is the Difference Between Seamless and Welded 304H Heat Exchanger Tubes? +

Seamless tubes (ASTM A213) have no weld and can handle higher pressure. Welded tubes (ASTM A249) are made from metal strip and are better for medium-pressure use at a lower cost.

What Temperature Range Can 304H Heat Exchanger Tubes Withstand? +

304H heat exchanger tubes provide reliable service above 500°C, where the higher carbon content gives them an advantage over standard 304. Oxidation resistance holds in continuous service up to 920°C.

What is the Price of SS 304H Heat Exchanger Tubes? +

Prices range between ₹250 and ₹468 per kilogram and US $3.50–5.28 per kilogram or US $5–20 per metre, depending on size, quantity, and finish. Contact us for a quote based on your exact specifications.

What ASTM Standards cover 304H Heat Exchanger Tubes? +

ASTM A213 / ASME SA-213 covers seamless 304H boiler, superheater, and heat exchanger tubes. ASTM A249 / ASME SA-249 covers welded heat exchanger and condenser tubes.

How does 304H differ from 304L for Heat Exchanger Tubes? +

304H has 0.04–0.10% carbon for high-temperature creep resistance above 500°C. 304L limits carbon to 0.030% maximum for better intergranular corrosion resistance in lower-temperature aqueous environments.

Can 304H Heat Exchanger Tubes be U-Bent? +

Yes. 304H heat exchanger tubes can be U-bent with radii starting at 1.25 × OD. They can also be solution annealed after bending to relieve residual forming stresses.

What is the Minimum Order Quantity for 304H Heat Exchanger Tubes? +

Minimum order quantities vary by tube size, specification, and form. Contact Sachiya Steel International with your requirements for MOQ details and current lead times.