Manufacturer, Supplier & Exporter of ASTM A335 P1 Spool

ASTM A335 / ASME SA335 specification covers seamless ferritic alloy-steel pipes designed for high-temperature service. The P1 grade (UNS K11522) in A335 is a chromium–molybdenum low-alloy steel that is commonly used for power plant superheater, reheater, and boiler tubes. This makes it highly relevant for thermal power generation, petrochemical refineries, and other high-temperature, high-pressure industrial facilities...

ASTM A335 P1 Spools are seamless alloy steel pipes specifically designed for high-temperature service in pressure systems. The P1 grade, under the A335 standard, is a low-alloy chromium-molybdenum steel suitable for boilers, superheaters, and heat exchangers. These spools are often fabricated into pipe sections with precise lengths and end preparations to meet industrial requirements. The seamless nature ensures uniform strength and resistance to high-pressure environments...

Riddhi Siddhi Impex has established a strong domestic network across Indian cities such as Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and Nagpur, among others. This extensive reach enables industries across India to procure ASTM A335 P1 spools without long lead times, supporting large-scale infrastructure, thermal power plants, and petrochemical projects....

The chemical composition of ASTM A335 P1 spools typically includes 0.05–0.15% Carbon (C), 0.30–0.60% Manganese (Mn), 0.50–1.00% Silicon (Si), 1.00–1.50% Chromium (Cr), and 0.44–0.65% Molybdenum (Mo), with phosphorus and sulfur limited to ≤0.025%. This composition ensures excellent creep resistance, oxidation resistance, and high-temperature strength, making the spools suitable for industrial heat transfer applications..

Mechanically, ASTM A335 P1 spools offer a minimum tensile strength of 380–415 MPa and a yield strength of approximately 205 MPa, with elongation values of around 30% in longitudinal tests. These properties provide high durability and resistance to deformation under elevated temperatures and pressures, which is essential for power generation, refineries, and chemical plants..

ASTM A335 P1 Spools

Specification

Product Name	ASTM A335 P1 Spools
Manufacturer	Riddhi Siddhi Impex
Base Material	Alloy Steel (Chromium-Molybdenum)
Form	Seamless Tube / Spool
Standard	ASTM A335 / ASME SA335
Size Range	½" NB to 36" NB
Wall Thickness	Schedule 20, 40, 80, 160, XS, XXS
Length	Random or Cut to Size
Pipe Ends	Plain End (PE) / Beveled End (BE)
Applications	Boilers, Superheaters, Reheaters, Heat Exchangers, Industrial Piping

Chemical Composition

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

Mechanical Properties

Property	Value
Yield Strength	≥ 205 MPa
Tensile Strength	380 – 415 MPa
Elongation	≥ 30%
Impact Test	As per ASTM requirements (typically Charpy test)

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
½"	21.3	2.77 – 4.78	Random / Cut to Size
2"	60.3	2.77 – 6.02	Random / Cut to Size
6"	168.3	4.85 – 12.7	Random / Cut to Size
12"	323.9	6.02 – 19.05	Random / Cut to Size
24"	609.6	12.7 – 25.4	Random / Cut to Size

Equivalent Grades

Standard	Equivalent Grade
ASTM / ASME	A335 P1 / SA335 P1
European (EN)	1.5415
DIN	16Mo3 / 13CrMo4-5

Equivalent Standards

Standard	Description
ASTM A335	Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASME SA335	Equivalent ASME Standard for Alloy Steel Pipes
EN 10216-2	Seamless Steel Tubes for Pressure Purposes

Other Types of Alloy Steel Pipes

Type	Description
A335 P5	Higher chromium-molybdenum alloy for elevated temperature service
A335 P11	Chromium-molybdenum steel for superheater and reheater applications
A335 P22	High-temperature alloy pipe with superior strength for boilers
A335 P91	Advanced alloy steel for ultra-supercritical power plants

Procuring ASTM A335 P1 spools from domestic suppliers like Riddhi Siddhi Impex ensures lower lead times, reduced import costs, and compliance with Indian regulatory standards. For industries requiring high-temperature piping solutions, these spools offer reliable performance, longevity, and adaptability. With their availability across almost every major industrial city in India, they serve as a dependable choice for critical applications in power, petrochemical, and chemical process industries..

Frequently Asked Questions (FAQs)

Q1: What are the primary applications of ASTM A335 P1 Spools?

A1: They are used in boilers, superheaters, reheaters, heat exchangers, and high-temperature piping systems.

Q2: Can ASTM A335 P1 Spools be supplied in custom lengths and wall thicknesses?

A2: Yes, Riddhi Siddhi Impex offers spools in random lengths or cut-to-size, with standard and custom wall thicknesses.

Q3: Are these spools available in Indian cities like Mumbai, Delhi, Bengaluru, and Hyderabad?

A3: Yes, the spools are available across all major Indian industrial cities, including Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and more.

Q4: Do ASTM A335 P1 Spools come with quality certification?

A4: Yes, each spool is supplied with a mill test certificate (MTC) verifying chemical composition, mechanical properties, and compliance with ASTM/ASME standards.