Manufacturer, Supplier & Exporter of Hot Dip Galvanized (HDG) Pipes

Hot‑dip galvanized (HDG) pipes refer to steel pipes whose exterior (and in many cases interior) surfaces have been coated with a layer of zinc by immersing the steel in a bath of molten zinc. This zinc coating forms a metallurgical bond with the steel, providing a durable, corrosion‐resistant surface. HDG pipes are widely used in applications where protection against rust and environmental exposure is important — for example structural uses, water & wastewater systems, fencing, outdoor industrial installations, and general civil engineering. The zinc coating acts sacrificially (the zinc corrodes preferentially to the steel), thereby extending the life of the steel pipe substantially compared to bare steel..

The major advantages of HDG pipes include long lifespan (especially in outdoor or corrosive environments), low maintenance, uniform protection (especially if the galvanizing is properly done), and cost‐effectiveness over the life cycle. Additionally, if damage occurs on the coating, the zinc still protects by galvanic action. Typical specifications of HDG pipes will include: pipe size (outer diameter), wall thickness (schedule or nominal), the steel grade (e.g., mild steel, carbon steel), galvanizing thickness (often defined in µm or grams per square metre), adherence to relevant standards (for example IS 1239/ IS 3589 in India for mild steel pipes; galvanizing standards like IS 2629, IS 2633). For structural/pipe uses the quality of steel, surface preparation, and galvanizing bath parameters all matter to ensure the required durability and performance..

Hot Dip Galvanized (HDG) pipes are steel pipes coated with a protective layer of zinc through immersion in molten zinc. This process creates a metallurgical bond between the steel and zinc, resulting in excellent corrosion resistance. HDG pipes are widely used in infrastructure, water supply, industrial applications, fencing, scaffolding, and outdoor structural projects due to their long service life and minimal maintenance requirements. The zinc coating acts sacrificially, protecting the steel even if the surface gets scratched or damaged...

HDG pipes are known for durability, cost-effectiveness, uniform protection, and resistance to environmental degradation. They are manufactured to various standards such as IS 1239, IS 3589 for steel pipes, and IS 2629/IS 2633 for galvanizing. Typical specifications include pipe diameter, wall thickness, steel grade, and galvanizing thickness, ensuring that the pipes meet the performance requirements of construction and industrial projects. Proper quality control during steel preparation and galvanization is critical for ensuring consistent performance...

Riddhi Siddhi Impex is a recognized manufacturer and supplier of various metal products, including steel pipes, flanges, fittings, sheets, and plates. Headquartered in Mumbai with operations in Vadodara, the company has established a strong presence in the Indian market. Their expertise in stainless steel, carbon steel, and alloy products positions them to supply HDG pipes, catering to both large-scale industrial and construction needs. The company emphasizes product quality, timely delivery, and adherence to standards..

Hot Dip Galvanized (HDG) Pipes

Specification

Product Name	Hot Dip Galvanized (HDG) Pipes
Manufacturer	Riddhi Siddhi Impex
Base Material	Carbon Steel / Mild Steel
Coating Material	Zinc (Hot Dip Galvanization)
Standard	IS 1239 / IS 3589 / 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	45–100 microns (Customizable)
Pipe Ends	Plain End (PE), Beveled End (BE), or Threaded
Form	Seamless, Welded, ERW, or LSAW
Applications	Water Supply, Drainage, Structural Projects, Fencing, Scaffolding, Industrial Piping

Chemical Composition (Base Carbon Steel)

Element	Content (%)
Carbon (C)	0.25 Max
Manganese (Mn)	0.30 – 1.20
Phosphorus (P)	0.05 Max
Sulfur (S)	0.05 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	Good (Improved by Zinc Coating)
Coating Adhesion	Strong Adhesion per IS 2633 / ISO 1461

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	A53 / A106 / A135
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
IS 1239 / IS 3589	Specification for Steel Tubes and Galvanized Pipes for Water and Structural Use
ISO 1461	Hot Dip Galvanized Coatings on Fabricated Iron and Steel Articles
ASTM A123	Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
API 5L	Specification for Line Pipe

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
PP Coated Pipes	Polypropylene-coated carbon steel pipes for water, chemical, and oil transport
PE Coated Pipes	Polyethylene-coated carbon steel pipes for underground applications

Riddhi Siddhi Impex has an extensive supply network covering major Indian cities such as Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Bhilayat, Somnath, Dahej, Navsari, Valsad, and Rajpipla. This extensive reach ensures that clients across India can access high-quality HDG pipes efficiently.

Q1: What are the common applications of Hot Dip Galvanized (HDG) Pipes?

A1: HDG pipes are widely used in water supply systems, drainage, fencing, scaffolding, structural framing, industrial piping, and outdoor infrastructure projects due to their corrosion resistance and durability.

Q2: Can you supply HDG pipes in custom sizes and thicknesses?

A2: Yes, Riddhi Siddhi Impex offers HDG pipes in various diameters, wall thicknesses, and lengths tailored to your project requirements.

Q3: Are HDG pipes corrosion-resistant?

A3: Yes, the zinc coating provides excellent protection against rust and corrosion, extending the lifespan of the pipes, even in outdoor or industrial environments.

Q4: Which cities in India does Riddhi Siddhi Impex supply HDG pipes to?

A4: They supply across major Indian cities including Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, Surat, Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, Amritsar, Chandigarh, Mysuru, Udaipur, Jodhpur, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, Mangalore, Nashik, Kolhapur, Chandrapur, Akola, Bhilayat, Somnath, Dahej, Navsari, Valsad, and Rajpipla.

Q5: What standards do Riddhi Siddhi Impex HDG pipes comply with?

A5: The HDG pipes adhere to Indian Standards such as IS 1239 and IS 3589 for steel pipes, and IS 2629/IS 2633 for galvanization, ensuring high-quality and durable products.

Q6: Can Riddhi Siddhi Impex provide complementary fittings and flanges with HDG pipes?

A6: Yes, they offer a complete range of compatible flanges, fittings, and accessories to accompany HDG pipes, making procurement convenient and integrated.

Q7: How long do HDG pipes last?

A7: With proper galvanization and handling, HDG pipes can last 20–50 years depending on environmental conditions, making them a cost-effective choice for long-term projects.

Q8: Do you provide technical support or consultation for HDG pipe selection?

A8: Yes, Riddhi Siddhi Impex provides technical guidance on pipe selection, sizing, and installation to ensure optimal performance for your specific application.