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ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

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ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

Brand Name:	YUHONG
Model Number:	ASTM A268 TP409 Stainless Steel Seamless Tube
MOQ:	1000kgs
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Payment Terms:	L/C,T/T

Detail Information

Product Description

Ratings & Reviews

Detail Information

Place of Origin:

CHINA

Certification:

ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Product Name:

Ferretic Stainless Steel Tube

Standard:

ASTM A268, ASME SA268

Material:

TP409 , UNS S40900

OD:

1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", Etc.

Thickness:

BWG10-25

Length:

Single Random, Double Random & Cut Length

End:

Plain End, Beveled End

Highlight:

ASTM A268 TP409 Stainless Steel Tube, Seamless Steel Heat Exchanger Tube

Product Description

ASTM A268 UNS S40900 / TP409 Ferretic Stainless Steel Seamless Tube Heat Exchanger Tube

ASTM A268 TP409 (UNS S40900) is a ferritic, titanium-stabilized stainless steel seamless heat exchanger tube. It offers moderate corrosion and high-temperature oxidation resistance, good weldability/formability, magnetic structure, and low nickel cost. Supplied annealed or pickled, it commonly serves condensers, coolers, exhaust, and EGR systems. Minimum tensile strength is 380 MPa per ASTM A268/A268M. Typical applications include shell-and-tube heat exchanger tubes.

Key Characteristics

Good resistance to high-temperature oxidation and exhaust gas corrosion.
Good weldability and formability.
Moderate corrosion resistance — better than carbon steel, but generally lower than 304/316 stainless steel.
Not recommended for severe chloride, marine, or strongly corrosive environments.
Lower cost than austenitic grades because of its low nickel content.
Titanium stabilization improves resistance to intergranular corrosion after welding.

How to choose right materials of A268 ferritic and martensitic tube?

Grade	UNS	Family	Key composition	Corrosion	High-temp	Weldability	Typical use
TP405	S40500	Ferritic	~12Cr + Al	Moderate	Good oxidation/sulfur	Good	Heat exchangers, condensers, refinery
TP409	S40900	Ferritic	~11Cr + Ti	Moderate	Good to ~700°C	Good	Auto exhaust, EGR, heat exchangers
TP410	S41000	Martensitic	~12Cr	Low–moderate	Limited	Poor	High strength, valves, pumps, cutlery
TP430	S43000	Ferritic	~17Cr	Better	Good	Good	Food, nitric acid, appliances, general heat exchangers
TP444	S44400	Ferritic	~18Cr + 2Mo + Ti/Nb	Best of these; pitting/chloride resistant	Good	Good	Hot water, solar, heat exchangers, 316L替代
TP446	S44600	Ferritic	~25Cr	Oxidation resistant	Excellent	Fair	High-temp furnace parts

Note: TP444 may not be listed in every edition of A268. Confirm coverage in the latest ASTM A268/A268M or equivalent specification.

Equivalent Grade of ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

STANDARD	WERKSTOFF NR.	UNS	JIS
TP409	1.4512	UNS S40900	SUS409

Chemical Composition % of ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

C	Mn	P	S	Si	Ni	Ti	Cr
≤0.08%	≤1.00%	≤0.045%	≤0.030%	≤1.00%	≤0.5%	6*C min, 0.75 max	10.5%~11.7%

*UNS S40900 often specifies Ti as 6 × (C + N) min, 0.75 max. Nitrogen may be limited to about 0.030 max in some product specifications.

Mechanical Properties of ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

Grade	Tensile Strength	Yield Strength	Elongation	Hardness
TP409	≥380 MPa	≥170 MPa	≥20%	88 HRB max

Heat Treatment

Annealing temperature: 815–900 °C (1500–1650 °F), followed by air cooling.
Supplied in annealed, pickled, bright-annealed, or polished condition depending on order.

Application

Shell-and-tube heat exchangers
Condensers and air coolers
Feedwater heaters
Automotive exhaust heat exchangers
EGR coolers
Catalytic converter components
Furnace parts and high-temperature exhaust systems

ASTM A268 TP409 Stainless Steel Tube UNS S40900 Seamless Steel Heat Exchanger Tube

Ratings & Review

Overall Rating

4.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

33%

4 stars

33%

3 stars

33%

2 stars

1 stars

All Reviews

Marcus

Belize Jan 19.2026

Helpful (1)

It's genuine 321H — titanium-stabilized, so no worries about sensitization or intergranular corrosion during welding. Our welder said it welded nicely with no cracking.

B*a

South Africa Dec 9.2025

Helpful (2)

Been running about 6 months now in cyclic service. No leaks, no failures. Heat transfer still where it should be.

Salem

Oman Sep 24.2025

Helpful (2)

We checked a few before installation — wall thickness consistent, roundness good. Welded in without problems.

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

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Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

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Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube