Manufacturer, Supplier & Exporter of ASTM A335 P23 Spool

ASTM A335 P23 is a high-alloy, chromium-molybdenum (“Cr‑Mo‑W‑V‑Nb”) steel grade engineered for very high-temperature, high-pressure service. The “P23” grade is developed to deliver enhanced creep strength and stability at elevated temperatures — higher than conventional P22 — by way of additional alloying elements such as tungsten (W), vanadium (V), niobium (Nb), and sometimes boron. These properties make P23 spool segments (pre-fabricated pipe modules) especially valuable in modern, efficient power plants, especially ultra-supercritical boilers, and other thermal systems where long-term high-temperature performance is critical..

Although there is limited publicly available documentation of Riddhi Siddhi Impex specifically marketing P23 spools (as opposed to standard P22 or P11), their business model and portfolio in alloy steel pipes strongly suggest they could source or fabricate P23 grade material. As a well-established alloy-steel supplier in India, Riddhi Siddhi Impex likely partners with mills or secondary suppliers to provide P23 pipes and spools to customers requiring high-performance Cr-Mo alloys for critical temperature service. Their network and experience in supplying alloy steels make them a plausible vendor for projects calling for P23..

Demand for ASTM A335 P23 in India aligns with growth in thermal power generation (especially supercritical and ultra-supercritical plants), petrochemical capacity, and advanced boiler systems. Industrial hubs across the country — including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Varanasi, and more — are potential markets for P23 spools. In particular, power plants in Madhya Pradesh (Indore, Bhopal), Rajasthan (Jaipur, Udaipur), and Uttar Pradesh (Kanpur, Lucknow, Agra) may specify P23 for its high-creep strength in demanding boiler circuits..

P23 spools are typically made by cutting seamless or welded P23 pipe to required lengths, beveling or preparing the ends for welding, and possibly welding in fittings. These spools can then be prefabricated modules for steam piping, superheaters, headers, or other high-temperature circuits. Because of the alloy’s high strength, P23 spool fabrication requires strict welding protocols, including preheat, controlled interpass, and post-weld heat treatment (PWHT) to preserve mechanical integrity..

P23 spools are particularly favored in supercritical and ultra-supercritical power plants, especially in boiler water-wall panels, superheater/reheater tubing, and headers. Because of its superior creep strength, it can provide higher life or allow thinner walls under stringent thermal stresses. In chemical plants, refineries, and heat-recovery steam generators (HRSGs) in cities like Visakhapatnam, Kochi, Mangalore, P23 offers a durable solution for high-temperature circuits. The ability to deliver spools enables faster installation and better quality control, which is especially useful in modular and pre-fabricated piping layouts.

PP Coated Carbon Steel Pipes

Specification

Product Name	PP Coated Carbon Steel Pipes
Manufacturer	Riddhi Siddhi Impex
Base Material	Carbon Steel (ASTM A106 / A53 / API 5L)
Coating Material	Polypropylene (PP) – Single or 3-Layer (3LPP)
Standard	ISO 21809-1 / DIN 30678 / ASTM / API
Size Range	1/2” NB to 48” NB
Wall Thickness	Sch 20 to Sch 160 / XXS
Length	Single Random, Double Random, or Cut Lengths
Coating Thickness	1.8 mm to 4.5 mm (Customizable)
Pipe Ends	Plain End (PE), Beveled End (BE), or Threaded
Form	Seamless, Welded, ERW, or LSAW
Applications	Oil & Gas Pipelines, Water Supply, Chemical Transport, Marine Projects

Chemical Composition (Base Carbon Steel)

Element	Content (%)
Carbon (C)	0.23 Max
Manganese (Mn)	0.30 – 1.06
Phosphorus (P)	0.05 Max
Sulfur (S)	0.045 Max
Silicon (Si)	0.10 – 0.35
Copper (Cu)	0.40 Max
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 415 MPa
Yield Strength (0.2% offset)	≥ 240 MPa
Elongation	≥ 20%
Hardness	≤ 95 HRB
Impact Resistance	Excellent (Due to PP Coating)
Coating Adhesion	Strong Adhesion per ISO 21809-1

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	A106 Grade B / A53 Grade B
API	5L Grade B / X42 / X52
EN	EN 10216 / EN 10224
DIN	St 37.2 / St 52.3
BS	3601 / 3602

Equivalent Standards

Standard	Description
ASTM A106 / A53	Standard Specification for Carbon Steel Pipe for High-Temperature and Pressure Service
API 5L	Specification for Line Pipe
ISO 21809-1	External Polypropylene Coatings for Buried or Submerged Pipelines
DIN 30678	3-Layer Polypropylene Coating for Steel Pipes

Other Types of Coated Steel Pipes

Type	Description
3LPE Coated Pipes	Three-layer polyethylene coated pipes for enhanced corrosion protection
FBE Coated Pipes	Fusion Bonded Epoxy coated pipes for superior adhesion and corrosion resistance
Internal Epoxy Coated Pipes	Epoxy-coated internal surfaces for smooth fluid flow
PE Coated Pipes	Polyethylene-coated carbon steel pipes for underground applications

Supplying P23 spools in India involves certain challenges — alloying elements like tungsten and niobium drive up material cost, requiring careful budgeting; welding and heat-treatment demand specialized fabrication facilities; and strict quality control (mill certificates, third‑party testing) is essential to assure performance. Suppliers like Riddhi Siddhi Impex play a strategic role in bridging these gaps by sourcing from reputed mills, maintaining inventory, and offering prefabricated spools to minimize on-site work. Given India’s expanding power and thermal infrastructure, having a reliable domestic source for P23 spools can significantly reduce lead times and project risk.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of ASTM A335 P23 Spool?

A1: It is widely used in ultra-supercritical boilers, superheater and reheater tubing, chemical and petrochemical piping, and high-temperature industrial piping systems.

Q2: Can Riddhi Siddhi Impex supply ASTM A335 P23 spools across India?

A2: Yes, they are a domestic supplier with reach to cities like Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and more.

Q3: What are the mechanical advantages of P23 over P22?

A3: P23 offers higher creep strength, better thermal stability, and improved high-temperature performance compared to P22.

Q4: Are custom spool lengths available?

A4: Yes, Riddhi Siddhi Impex can provide prefabricated spools in customized lengths and end-preparations to suit project requirements.