Manufacturer, Supplier & Exporter of ASTM A335 P11 Spool

ASTM A335 P11 spools are seamless alloy steel tubes engineered for high-temperature, high-pressure applications. The “P11” grade is a chromium‑molybdenum ferritic steel containing about 1.0–1.5% chromium and 0.44–0.65% molybdenum, which gives it a good combination of strength, creep resistance, and high-temperature corrosion resistance. Because of these characteristics, P11 is commonly used in steam lines, boiler systems, superheaters, and process piping in power plants and petrochemical plants..

Assuming a supplier like Riddhi Siddhi Impex, they could import or stock ASTM A335 P11 spools and serve as a critical domestic distributor in India. By maintaining inventory in their warehouses, they would be able to supply fabricators, EPC contractors, and boiler manufacturers efficiently. Their supply chain could cover major industrial and metro hubs across India, thus catering to local demand for high-temperature alloy steel without long import lead times..

ASTM A335 P11 spools are high-performance alloy steel tubes designed for high-temperature, high-pressure applications. The P11 grade is a chromium-molybdenum ferritic steel with approximately 1% chromium and 0.5% molybdenum, providing excellent creep resistance, thermal strength, and corrosion resistance. These properties make it ideal for use in boilers, superheaters, heat exchangers, and industrial piping systems in power plants, petrochemical units, and refineries...

Riddhi Siddhi Impex is a reputed manufacturer and supplier of ASTM A335 P11 spools in India. They maintain stock of seamless alloy steel tubes and spools, ensuring reliable and timely supply to domestic industries. Their distribution network covers major Indian cities including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and Rajkot, among others, ensuring project requirements are met efficiently..

With warehouses in strategic locations, Riddhi Siddhi Impex can serve industries in cities such as Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, and Mangalore. This ensures reduced lead time and easier procurement, critical for time-sensitive industrial projects in India’s power generation and process sectors..

ASTM A335 P11 Alloy Steel Pipes / Spools

Specification

Product Name	ASTM A335 P11 Alloy Steel Pipes / Spools
Manufacturer	Riddhi Siddhi Impex
Base Material	Alloy Steel (Chromium-Molybdenum, Cr-Mo)
Standard	ASTM A335 / ASME SA335
Size Range	1/2” NB to 24” NB (or as per customer requirement)
Wall Thickness	Sch 10 to Sch XXS / Custom
Length	Random or Cut-to-Length, up to 16,000 mm
Pipe Ends	Plain End (PE) / Beveled End (BE)
Form	Seamless / Welded
Applications	High-Temperature Service, Boilers, Heat Exchangers, Superheaters

Chemical Composition

Element	Content (%)
Carbon (C)	0.05 – 0.15
Manganese (Mn)	0.30 – 0.60
Silicon (Si)	0.50 – 1.00
Phosphorus (P)	≤ 0.025
Sulfur (S)	≤ 0.025
Chromium (Cr)	1.00 – 1.50
Molybdenum (Mo)	0.44 – 0.65

Mechanical Properties

Property	Value
Tensile Strength	≥ 415 MPa
Yield Strength (0.2% offset)	≥ 205 MPa
Elongation	≥ 30%
Hardness	Max ~250 HB

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 16 m
1"	33.4	3.38	Up to 16 m
2"	60.3	3.91	Up to 16 m
4"	114.3	6.02	Up to 16 m
6"	168.3	7.11	Up to 16 m
10"	273.1	9.27	Up to 16 m
16"	406.4	12.70	Up to 16 m

Equivalent Grades

Standard	Grade
ASME	SA335 P11
UNS	K11597
EN / DIN	1.7335 / 13CrMo4-5
BS	BS 3604 Grade 621

Equivalent Standards

Standard	Description
ASTM A335 / ASME SA335	Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
EN 10216 / DIN	Seamless Alloy Steel Tubes for Pressure Purposes

Other Types of Alloy Steel Pipes

Type	Description
P1	Low alloy steel for lower temperature service
P5	Chromium-Molybdenum alloy for moderate temperature service
P9	High creep strength steel for medium temperature applications
P22	Cr-Mo steel for high-temperature pressure service
P91 / P92	Advanced creep-resistant steel for ultra-high temperature service

ASTM A335 P11 spools have a minimum tensile strength of 415 MPa and minimum yield strength of 205 MPa, with elongation of approximately 30%. These mechanical properties provide high creep and stress rupture resistance, making P11 ideal for steam piping, heat exchangers, and high-pressure boiler applications. The steel can also withstand repeated thermal cycling without significant loss of mechanical integrity..

Frequently Asked Questions (FAQs)

Q1: What are the common applications of ASTM A335 P11 Spool?

A1: ASTM A335 P11 Spools are widely used in high-temperature and high-pressure applications, such as boilers, heat exchangers, superheaters, petrochemical plants, and power generation industries.

Q2: Can Riddhi Siddhi Impex supply custom sizes and lengths?

A2: Yes, we provide ASTM A335 P11 Spools in custom diameters, wall thicknesses, and lengths according to project requirements.

Q3: What is the temperature range for ASTM A335 P11 Spool?

A3: ASTM A335 P11 alloy steel is suitable for high-temperature service up to 540°C (1000°F), making it ideal for steam, gas, and oil pipelines.

Q4: Are ASTM A335 P11 Spools available in seamless and welded forms?

A4: Yes, Riddhi Siddhi Impex supplies ASTM A335 P11 Spools in both seamless and welded configurations to meet diverse industrial needs.