Manufacturer, Supplier & Exporter of Alloy 20 Spool

Alloy 20 Spool is one of the most preferred piping spool solutions for industries handling highly corrosive media such as sulfuric acid, phosphoric acid, and chloride-rich environments. Manufactured with precision using Alloy 20 (UNS N08020), this nickel–iron–chromium-based superalloy provides an excellent balance of corrosion resistance, mechanical strength, and long-term performance. Riddhi Siddhi Impex, a trusted manufacturer and supplier, produces Alloy 20 spools that meet stringent global standards and withstand extreme industrial service conditions..

As a leading Alloy 20 Spool Manufacturer in India, Riddhi Siddhi Impex ensures that each spool is fabricated with accuracy to match required dimensions, tolerances, and project specifications. These spools are widely used in chemical processing plants, petrochemical units, power generation facilities, pharmaceuticals, offshore operations, and pollution control systems. Their ability to resist pitting, crevice corrosion, and stress corrosion cracking makes them ideal for harsh chemical manufacturing units.

One of the major strengths of Alloy 20 Spools is their exceptional performance in sulfuric acid, a chemical known for its aggressive corrosive nature. The alloy contains molybdenum, copper, and niobium, improving resistance to acid attack and providing stabilization against intergranular corrosion. Riddhi Siddhi Impex manufactures spools using high-grade raw materials sourced from certified mills to ensure performance, durability, and long-lasting reliability..

Riddhi Siddhi Impex is recognized as a reliable domestic supplier of Alloy 20 Spool across all major industrial regions of India. The company supplies to key metropolitan and industrial hubs including Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, and Varanasi. Their strong logistics network ensures timely delivery for project requirements of any scale..

The company further caters to expanding industrial clusters such as Amritsar, Chandigarh, Mysuru (Mysore), Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, and more. Major chemical and petrochemical regions like Vilayat, Dahej, Somnath, Narmada, Ankleshwar, Navsari, Valsad, and Rajpipla also rely on Riddhi Siddhi Impex for consistent supply of Alloy 20 Spools.

Alloy 20 Spool – Specification, Composition & Mechanical Data

Specification

Product Name	Alloy 20 Spool
Manufacturer	Riddhi Siddhi Impex
Material Grade	Alloy 20 (Carpenter 20 / UNS N08020)
Standards	ASTM B729 / B464 / B468, ASME SB729/SB464
Size Range	1/2” NB to 24” NB (Customizable)
Schedule	Sch 10 to Sch XXS
Manufacturing Types	Seamless, Welded, Fabricated
Forms	Spool Assembly, Prefabricated Spool, Piping Spool
Applications	Chemical Processing, Petrochemicals, Food Processing, Pharmaceuticals, Pulp & Paper

Chemical Composition

Element	Content (%)
Nickel (Ni)	32 – 38%
Chromium (Cr)	19 – 21%
Iron (Fe)	Balance
Molybdenum (Mo)	2 – 3%
Copper (Cu)	3 – 4%
Niobium (Nb)	8xC – 1%
Manganese (Mn)	1 – 2%
Carbon (C)	0.07% Max
Silicon (Si)	1% Max

Mechanical Properties

Property	Value
Tensile Strength	620 MPa (Min)
Yield Strength (0.2%)	300 MPa (Min)
Elongation	30% (Min)
Hardness	95 HRB Max
Density	8.08 g/cm³
Melting Point	1357 – 1430°C

Dimension Chart (Nominal)

Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Spool Length
1/2"	21.3	2.77	Custom / Standard
1"	33.4	3.38	Custom / Standard
2"	60.3	3.91	Custom / Standard
4"	114.3	6.02	Custom / Standard
6"	168.3	7.11	Custom / Standard
10"	273.1	9.27	Custom / Standard

Equivalent Grades

Standard	Grade
UNS	N08020
Werkstoff	2.4660
EN	NiCr20CuMo
Trade Name	Carpenter 20

Equivalent Standards

Standard	Description
ASTM B729	Welded Alloy 20 Pipe
ASTM B464	Seamless Alloy 20 Pipe
ASME SB729 / SB464	Nickel Alloy Piping Standards
ISO	Nickel Alloy Corrosion Resistant Grades

Other Types of Alloy Spools

Type	Description
Incoloy 825 Spool	High corrosion resistance in chemical environments
Inconel 625 Spool	Superior oxidation & corrosion resistance
Hastelloy C276 Spool	Excellent performance in reducing environments
Monel 400 Spool	High strength and seawater resistance

Industries choose Alloy 20 Spools for their excellent thermal stability and ability to operate at elevated temperatures without deformation or corrosion. These spools maintain high mechanical strength even in highly acidic environments, ensuring longer service life and reducing maintenance downtime. This makes them a cost-effective solution for industries where reliability and safety are high priorities..

Frequently Asked Questions (FAQs)

Q1: What is Alloy 20 Spool used for?

A1: It is used in sulfuric acid handling, chemical processing, pharmaceuticals, and petrochemical plants.

Q2: Do you provide customized Alloy 20 spool sizes?

A2: Yes, Riddhi Siddhi Impex offers fully customized spools as per drawings and project requirements.

Q3: What cities do you supply Alloy 20 Spools to?

A3: Supplies are made to Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Pune, Ahmedabad, Surat, Vadodara, and all other major industrial cities.

Q4: Is Alloy 20 corrosion-resistant?

A4: Yes, Alloy 20 offers excellent resistance to sulfuric acid, chloride stress corrosion, and pitting.