Manufacturer, Supplier & Exporter of ASTM A106 Grade A Spool

ASTM A106 Grade A Spools are prefabricated piping components manufactured from seamless carbon-steel pipes that meet the ASTM A106 Grade A specification. These spools are widely used in high-temperature and moderate-pressure applications across industries such as oil & gas, petrochemicals, chemical processing, power plants and refineries. Grade A has excellent ductility and welding characteristics, making it suitable for spools that require frequent bending, flanging or forming without compromising structural integrity..

A pipe spool generally consists of straight pipes, elbows, reducers, flanges, and fittings welded together as per the client’s isometric drawing. Using ASTM A106 Grade A ensures the spool can withstand elevated temperatures while offering smooth workability for fabrication. The seamless nature of A106 pipe further ensures leak-proof operation, making these spools ideal for steam lines, boiler lines, process plants, and general fluid transportation systems..

Riddhi Siddhi Impex is known in the Indian metal industry as a supplier and stockist of carbon-steel materials confirming to ASTM and ASME standards. Their product range includes carbon-steel pipes and related components, enabling them to supply materials used in spool fabrication. Although ASTMA106 Gr B and Gr C are more commonly listed, they cater to a wide carbon-steel segment, and Grade A spool requirements can usually be fulfilled on request depending on project needs..

The company is headquartered in Mumbai and has over two decades of experience in supplying industrial metal products. Their strong distribution network enables them to cater to domestic customers requiring ASTM A106 Grade A material. For spool fabrication, customers often provide drawings, and the company coordinates with fabrication units to deliver ready-to-install spool assemblies..

ASTM A106 Grade A spools supplied through manufacturers and stockists like Riddhi Siddhi Impex undergo testing such as hydro-testing, visual inspection, non-destructive testing (NDT), weld examination, and dimensional verification. These quality checks ensure each spool meets project specifications and continues to perform safely under high-temperature service conditions..

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

WQuality assurance and adherence to standards are paramount at Riddhi Siddhi Impex. Their Acetal Ferrule Fittings undergo rigorous testing for dimensional accuracy, tensile strength, and chemical resistance to ensure optimum performance. The company also complies with international standards, guaranteeing that their fittings are suitable for critical industrial processes.

Frequently Asked Questions (FAQs)

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

A1: ASTM A106 Grade A Spools are commonly used in high-temperature pipelines, refinery piping, power plant systems, steam lines, petrochemical plants, and general fluid transportation systems.

Q2: Do you provide custom spool fabrication?

A2: Yes, we offer fully customized spool fabrication based on client drawings, including custom lengths, fittings, flanges, weld configurations, and surface coatings.

Q3: What standards are followed during manufacturing?

A3: Spools are manufactured as per ASTM A106, ASME B31.3, ASME Section IX, and project-specific QA/QC requirements, including NDT, hydro testing, and dimensional checks.

Q4: Are ASTM A106 Grade A Spools suitable for high-temperature service?

A4: Yes, Grade A seamless carbon steel is designed for high-temperature operations and offers excellent ductility, which makes it suitable for boilers, heaters, and process plants.

Q5: What end connections are available?

A5: Pipe spools can be supplied with beveled ends, plain ends, threaded ends, or flanged ends depending on project specifications.

Q6: Can you supply ASTM A106 Grade A Spools across India?

A6: Yes, we supply spools to major cities including Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Indore, Jaipur, and many more industrial regions.