Manufacturer, Supplier & Exporter of ASTM A106 Grade B Spool

ASTM A106 Grade B Spool is one of the most widely used prefabricated piping components in high-temperature and high-pressure applications. These spools are manufactured using seamless carbon steel pipes conforming to ASTM A106 Grade B specifications, ensuring exceptional strength, weldability, and long-term reliability in demanding industrial environments. Riddhi Siddhi Impex, a trusted name in the steel industry, is known for manufacturing precision-finished ASTM A106 Grade B Spools engineered for efficient installation in critical piping systems..

As a prominent manufacturer and supplier, Riddhi Siddhi Impex produces ASTM A106 Grade B Spools in various configurations including straight pipe sections, elbow spools, reducer spools, flanged spools, and fully customized spools based on isometric drawings. Each spool undergoes strict quality testing such as hydro testing, NDT, and dimensional accuracy checks to ensure full compliance with international standards. This makes the company a dependable choice for industries such as oil & gas, petrochemical, power plants, refineries, boilers, and process piping systems..

Riddhi Siddhi Impex is recognized as a premier ASTM A106 Grade B Spool domestic supplier across India, delivering ready-to-install prefabricated piping assemblies to government projects, EPC contractors, chemical plants, and turnkey fabrication companies. Their manufacturing setup is supported by advanced welding, cutting, and finishing facilities, enabling fast production and consistent quality in every spool supplied..

In major industrial hubs such as Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, and Rajkot, Riddhi Siddhi Impex has built a strong supply network ensuring timely delivery of ASTM A106 Grade B Spools for all types of industrial projects. These cities have a growing demand for reliable carbon steel piping components, and the company’s strong logistics ensure uninterrupted material availability..

Apart from metro cities, Riddhi Siddhi Impex also caters to expanding industrial zones in Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, and Visakhapatnam, supplying high-quality ASTM A106 Grade B Spools to fabrication workshops, industrial estates, and pipeline contractors. Their strong technical expertise and adherence to strict manufacturing standards make them a preferred supplier in these regions.

ASTM A106 Grade B Spool

Specification

Product Name	ASTM A106 Grade B Spool
Manufacturer	Riddhi Siddhi Impex
Material Grade	Carbon Steel – ASTM A106 Grade B
Type	Prefabricated Pipe Spool Assemblies
Process	Seamless / Hot Finished / Cold Drawn
Size Range	1/2” NB to 36” NB
Wall Thickness	Sch 20 to Sch 160 / XXS
Ends	Plain End, Beveled End, Flanged End
Fabrication	Welded, Flanged, Elbow Spool, Tee Spool, Reducer Spool
Applications	Refineries, Boilers, Power Plants, Oil & Gas, Petrochemical, Steam Lines

Chemical Composition

Element	Content (%)
Carbon (C)	0.30 Max
Manganese (Mn)	0.29 – 1.06
Phosphorus (P)	0.035 Max
Sulfur (S)	0.035 Max
Silicon (Si)	0.10 Min
Copper (Cu)	0.40 Max
Nickel (Ni)	0.40 Max
Chromium (Cr)	0.30 Max
Molybdenum (Mo)	0.15 Max
Vanadium (V)	0.08 Max

Mechanical Properties

Property	Value
Tensile Strength	≥ 485 MPa
Yield Strength	≥ 240 MPa
Elongation	≥ 30%
Hardness	≤ 79 HRB
Impact Resistance	Excellent under high pressure
Weldability	Superior – Suitable for SMAW, MIG, TIG, SAW

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Standard 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
ASME	SA106 Grade B
API	API 5L Grade B / X42 (Comparable)
EN	P265GH / P235GH (Approx.)
DIN	St 45.8 / St 52.0

Equivalent Standards

Standard	Description
ASTM A106	Seamless Carbon Steel Pipes for High-Temperature Service
ASME SA106	Pressure Piping Applications
API 5L	Specification for Line Pipe
ASTM A53	Black & Hot-Dipped Carbon Steel Pipes

Other Types of Carbon Steel Spools

Type	Description
Elbow Spool	Spool assembly with elbows for directional change
Tee Spool	Used for branching pipeline connections
Reducer Spool	Concentric or eccentric reducer welded spools
Flanged Spool	Spool with flanges for easy installation
Custom Fabricated Spool	Manufactured as per drawings or project specifications

The company also dominates the market as a leading ASTM A106 Grade B Spool domestic supplier in major chemical and industrial belts such as Dahej, Vilayat, Somnath, Narmada, Ankleshwar, Navsari, Valsad, Rajpipla, and other Gujarat industrial corridors. These regions rely heavily on seamless carbon steel spools due to the presence of large chemical complexes, pharma units, fertilizer plants, and heavy engineering industries. Riddhi Siddhi Impex’s timely supply ensures minimum downtime for ongoing projects.

Frequently Asked Questions (FAQs)

Q1: What are the common applications of ASTM A106 Grade B Spool?

A1: ASTM A106 Grade B Spools are widely used in high-temperature and high-pressure piping systems such as boilers, refineries, power plants, petrochemical units, oil & gas pipelines, and steam services.

Q2: Do you provide customized ASTM A106 Grade B Spools?

A2: Yes, we manufacture fully customized spools including elbow spools, reducer spools, flanged spools, and fabricated spools based on drawings, isometrics, and project specifications.

Q3: Are ASTM A106 Grade B Spools suitable for welding?

A3: Yes, A106 Grade B seamless carbon steel offers excellent weldability and is compatible with standard industrial welding processes like SMAW, MIG, TIG, and automatic welding.

Q4: What pressure and temperature conditions can ASTM A106 Grade B Spools withstand?

A4: ASTM A106 Grade B Spools are designed to withstand high pressure and temperatures up to 425°C–450°C depending on wall thickness (schedule) and service conditions.