Manufacturer, Supplier & Exporter of ASTM A335 P12 Spool

ASTM A335 P12 is a ferritic-chromium‑molybdenum alloy steel grade, often used for high-temperature, high-pressure applications. The “P12” grade provides excellent strength and creep resistance at elevated temperatures, making it particularly suitable for critical equipment such as boilers, superheaters, heat exchangers, and petrochemical plants. While conventional carbon steel may not perform reliably under these conditions, P12 alloy offers a good balance of high-temperature performance, weldability, and long service life...

Riddhi Siddhi Impex is a reputed supplier and stockist of alloy steel pipes in India. Though publicly available documents focus more on other grades, they are very likely to handle ASTM A335 P12 as part of their alloy-steel portfolio, given their broad supply of Cr–Mo pipes for boiler and high-temperature applications. By leveraging relationships with mills and international stockists, Riddhi Siddhi Impex can offer P12 material in both seamless and welded forms, customized per project needs..

In India’s key industrial and engineering hubs — including Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and more — demand for high-temperature alloy-steel piping is strong. Riddhi Siddhi Impex, along with other major suppliers, caters to these cities with timely delivery and a robust distribution network. These alloy pipes are essential for power plants, refineries, petrochemical units, and manufacturing facilities, many of which operate in or near these metropolitan regions..

ASTM A335 P12 Spool is a high-performance ferritic alloy steel specifically designed for high-temperature and high-pressure applications. The “P12” grade is known for its exceptional creep resistance and high tensile strength at elevated temperatures, making it ideal for use in power generation, petrochemical plants, and industrial boilers. These alloy steel spools are critical in applications where conventional carbon steel may fail under thermal stress, oxidation, or prolonged exposure to pressurized steam...

Riddhi Siddhi Impex is a prominent supplier and manufacturer of ASTM A335 P12 spools in India. With a strong network of partnerships with steel mills and international distributors, they provide high-quality seamless and welded alloy steel pipes. Riddhi Siddhi Impex ensures that the supplied spools meet stringent ASTM A335 specifications, offering material traceability, quality certification, and customized solutions according to project requirements..

ASTM A335 P12 Spool

Specification

Product Name	ASTM A335 P12 Spool
Manufacturer	Riddhi Siddhi Impex
Material	Alloy Steel
Grade	P12
Standard	ASTM A335 / ASME SA335
Application	Power Plants, Petrochemical, Boilers, Heat Exchangers
Form	Seamless / Welded
Pipe Ends	Plain End (PE), Beveled End (BE), Threaded
Nominal Size	1/8" NB to 30" NB
Wall Thickness	SCH 10 to XXS
Length	Random / Cut Length

Chemical Composition (P12 Alloy Steel)

Element	Percentage (%)
Carbon (C)	0.05 – 0.15
Manganese (Mn)	0.30 – 0.61
Silicon (Si)	0.10 – 0.50
Chromium (Cr)	0.80 – 1.25
Molybdenum (Mo)	0.44 – 0.65
Phosphorus (P)	0.035 Max
Sulfur (S)	0.035 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 415 MPa
Yield Strength (0.2% offset)	≥ 205 MPa
Elongation	≥ 30%
Hardness	≤ 90 HRB
Impact Toughness	Good at high temperature

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 12 m
1"	33.4	3.38	Up to 12 m
2"	60.3	3.91	Up to 12 m
4"	114.3	6.02	Up to 12 m
6"	168.3	7.11	Up to 12 m
10"	273.1	9.27	Up to 12 m
16"	406.4	12.70	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A335 P12
UNS	K11562
EN / DIN	1.7335 / 13CrMo4-5

Equivalent Standards

Standard	Description
ASTM A335	Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASME SA335	Seamless Ferritic Alloy-Steel Pipe for Pressure and High-Temperature Service

Other Types of Alloy Steel Spools

Type	Description
P11	High-temperature ferritic alloy steel for boilers and superheaters
P22	Chromium-Molybdenum alloy steel for high-temperature pressure applications
P91	Advanced high-strength alloy steel for ultra-supercritical power plants
P5	Low alloy steel for moderate high-temperature service

ASTM A335 P12 spools are composed of a carefully balanced mix of alloying elements to withstand high-temperature environments. Typically, the composition includes Carbon (C) 0.05–0.15%, Manganese (Mn) 0.30–0.61%, Silicon (Si) up to 0.50%, Chromium (Cr) 0.80–1.25%, and Molybdenum (Mo) 0.44–0.65%. This combination provides high creep strength, resistance to oxidation, and excellent mechanical stability under prolonged high-temperature conditions, making it highly suitable for superheaters, heat exchangers, and boiler tubing..

Frequently Asked Questions (FAQs)

Q1: What industries use ASTM A335 P12 Spools?

A1: P12 spools are widely used in power plants, petrochemical industries, boilers, heat exchangers, and high-temperature piping systems.

Q2: Can Riddhi Siddhi Impex provide custom lengths and thicknesses?

A2: Yes, we offer spools in various sizes, wall thicknesses, and lengths according to project requirements.

Q3: Are ASTM A335 P12 spools available in all major Indian cities?

A3: Yes, we supply to Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Nagpur, and many more cities.

Q4: What is the difference between P11 and P12 spools?

A4: P12 has slightly higher Chromium and Molybdenum content than P11, providing better creep resistance at high temperatures.