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Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater

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Ms. Joyce Xia

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Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater

Brand Name:	YUHONG
Model Number:	ASTM A335 P9
MOQ:	500KGS
Price:	Negotiable
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:

Alloy Seamless Steel Pipe

Specification:

ASTM A335

Material:

Type:

Seamless

Ends:

Plain End, Beveled End

Surface:

Pickled And Annealed, Polished, Bright Annealed, Black Painting

MT, ET, HT, PT, PMI

Application:

Superheater, Reheater, Boiler, Heat Exchanger

Supply Ability:

According to Clients' requirements

Highlight:

ASTM A335 P9 alloy seamless pipe

black coating boiler steel tube

superheater reheater alloy steel pipe

Product Description

YUHONG brand goods have been already exported to more than 85 countries With more than 35 years' experience, because of strict quality control policy, excellent sales service, delivery on time. YUHONG won more and more new clients and got more and more repeat orders from old clients, in YUHONG People's mind: Quality is First Important!

Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater

A Black-Coated ASTM A335 P9 Alloy Seamless Steel Pipe is a chromium-molybdenum alloy steel pipe designed for high-temperature and high-pressure service. The pipe body offering excellent high-temperature strength, oxidation resistance, and sulfidation corrosion resistance. The external surface of the pipe undergoes a specialized "phosphating and saponification" treatment, which creates a uniform, adherent black protective coating. This coating primarily serves as temporary anti-corrosion protection during transportation, storage, and installation, and can also act as a lubricant to reduce friction during certain machining or handling processes. It is critical to note that this black coating is not a permanent high-temperature corrosion-resistant layer. It is typically required to be removed prior to the pipe being placed into high-temperature service, in accordance with specific system design and commissioning procedures.

ASTM/ASME	UNS	JIS G3458	UNS	BS	DIN 17175	ISO
A335 P9/ SA335 P9	K90941	STPA 26	S50400	3604 P1 629-470	X12CrMo91	2604 II TS38

1.Chemical & Mechanical Properties

ASTM A335 P9 Chemical Composition (%)
C	Mn	P	S	Si	Cr	Mo
≤0.15%	0.3%~0.6%	≤0.025%	≤0.025%	0.25%-1.00%	8.0%~10.0%	0.90%~1.10%

Mechanical Properties

Tensile Strength ksi/MPa	Yield Strength (0.2% offset) ksi/MPa	Hardness HBW	Heat Treatment Requirements ℉/℃
≥60/415	≥30/205	≤250	1250/675

Elongation(%)
Wall Thickness		Longitudinal	Transverse
in.	mm	Longitudinal	Transverse
5 ⁄16 (0.312)	8	30	20
9 ⁄32 (0.281)	7.2	28	19
1 ⁄4 (0.250)	6.4	27	18
7 ⁄32 (0.219)	5.6	26	...
3 ⁄16 (0.188)	4.8	24	...
5 ⁄32 (0.156)	4	22	...
1 ⁄8 (0.125)	3.2	21	...
3 ⁄32 (0.094)	2.4	20	...
1 ⁄16 (0.062)	1.6	18	...

2. Key Adventages

High-Temperature Strength: With its chromium and molybdenum content, P9 tubes exhibit excellent resistance to oxidation, creep, and deformation even under extreme temperatures.
Corrosion Resistance: Chromium provides superior resistance to oxidation and scaling, while molybdenum enhances corrosion resistance, particularly in acidic environments; Long service life with reduced maintenance costs.
Seamless Construction: The seamless design ensures superior strength, uniformity, and durability compared to welded tubes, making it ideal for critical applications.

3. Key Applications

Food Processing Equipment
Radiant Tubes
Coal Gasifier Internal Component
Oven Linings
Furnace Parts
Annealing Cover
Saggers
Heat Exchangers

ASTM A335 Grade P9 Pipe Sizes

O.D. x Thickness(mm)	O.D x Thickness(mm)	O.D x Thickness(mm)
38.1 x 3.2	57.0 x 4.9	76.2 x 4.0
38.1 x 4.0	57.0 x 6.3	76.2 x 5.0
38.1 x 6.3	57.0 x 7.9	76.2 x 6.3
42.4 x 3.2	60.3 x 3.2	82.5 x 4.5
42.4 x 4.0	60.3 x 3.6	88.9 x 3.2
44.5 x 3.2	60.3 x 5.0	88.9 x 3.6
44.5 x 6.3	63.5 x 3.2	88.9 x 4.0
48.3 x 3.2	63.5 x 3.6	101.6 x 3.6
48.3 x 3.6	63.5 x 4.0	101.6 x 4.5
50.8 x 4.5	63.5 x 6.3	101.6 x 6.3
51.0 x 3.2	63.5 x 7.9	114.3 x 3.6
51.0 x 3.6	70.0 x 3.2	114.3 x 5.0
51.0 x 6.3	70.0 x 3.6	139.7 x 4.0
57.0 x 3.2	70.0 x 6.3	139.7 x 5.0
57.0 x 3.6	76.2 x 3.6	139.7 x 6.3

Black Coating ASTM A335 P9 Alloy Seamless Steel Pipe for Superheater and Reheater 0

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

Rashid

United Arab Emirates Dec 10.2025

Helpful (2)

Good oxidation resistance, matches well with the T9. No scaling or thinning noticed.

Ivan Volkov

Russian Federation Nov 11.2025

Helpful (3)

As an engineer in Siberia, I tested these fin tubes in extreme cold (-30°C). The ASTM A213 T11 steel performed well with no thermal cracks, and cooling efficiency met expectations (88%). That said, the Russian-language documentation had translation errors in technical terms, causing minor confusion during installation.

Marek

Poland Sep 5.2025

Helpful (2)

Heat transfer has been consistent since day one. Our outlet temperatures are steady, and the exchanger is performing exactly as we expected.

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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