2-inch Galvanized Pipe

Specification

Item	2-inch Galvanized Pipe
Nominal Bore	DN50
Outer Diameter	60.3mm
Standard	ASTM A53/A795, EN 10255 (BS1387), NBR 5580/5590, JIS G3444, GOST 3262, GB/T 3091
Material	ASTM A53 Gr.A/Gr.B, Q195/Q235, S195/S235JR, STK400, GOST Ст3сп
Wall Thickness	2.5mm – 4.5mm
Galvanization	Hot-dip Galvanized (HDG)
Zinc Coating	Z30–Z275, 30g/m² – 275g/m²
Length	5.8m, 9m, 12m
Processing	Plain end, Threaded (threads + coupling), Grooved/Beveled
MOQ	10 tons

Advantages

1. High Corrosion Resistance: The hot-dip galvanized coating—comprising a zinc-iron alloy layer and a pure zinc layer—provides dual, long-lasting protection for the black carbon steel pipe, ensuring a service life of 20 years or more in standard environments.
2. High Versatility: We manufacture products in compliance with various standards; dimensions, tolerances, and thread specifications are globally standardized, making them suitable for a wide range of operating conditions.
3. Excellent Mechanical Properties: The pipes offer good impact toughness; actual pressure-bearing capacity depends on the wall thickness grade (approximately 1.6 MPa for SCH40, with higher ratings for SCH80).
4. High Cost-Effectiveness: The hot-dip galvanizing process is mature, and this specific size is a standard, high-volume market commodity, ensuring cost-efficiency.

Application

1. Fire Protection: Outdoor fire hydrant supply lines and indoor ceiling sprinkler piping; these are the standard pipe materials specified for fire protection projects worldwide.
2. Building Plumbing & Drainage: Rainwater drainage pipes, temporary construction site water supply lines, and non-potable water transport systems.
3. Gas & Power: Residential natural gas service lines, as well as cable protection and electrical conduit pipes.
4. Agriculture & Livestock: Fence posts for grassland enclosures, welded pipe materials for cattle pen panels, and horizontal rails for horse farm fencing.
5. Other: Scaffolding pipes, metal supports for large municipal trees, mechanical structural components, and support structures for orchards and flower cultivation sites.

Common Standards and Materials

Standard	Commonly materials
ASTM A53 / A795	Grade A / Grade B
EN 10255 (BS 1387)	S195 / S235JR
NBR 5590 / NBR 5580	Grade A / Grade B
JIS G3444	STK400
GOST 3262	Ст3сп

Equivalent Reference

ASTM A53 Gr.B ≈ S235JR ≈ GOST Ст3сп≈ Q235B.

Mechanical properties of various materials

Grade	Yield strength (MPa)	Tensile strength (MPa)	Percentage elongation after fracture A (%)
Grade A	≥205	≥330	≥35
Grade B	≥240	≥415	≥30
S195	≥195	320~520	≥20
S235JR	≥235	360~510	≥25
STK400	≥235	≥400	≥23
Ст3сп	≥235	370~480	≥25

The table above lists the minimum mechanical property requirements; the galvanizing process does not alter the mechanical properties of the base material.

How are 2-inch galvanized pipes manufactured?

The overall process consists of four stages: black pipe prefabrication, pretreatment, hot-dip galvanizing, and post-treatment.

Black pipe inspection → Pickling → Fluxing pretreatment → Hot-dip galvanizing in a molten zinc bath (440–460°C) → External and internal air wiping to finish the zinc coating → Cooling and passivation → Quality inspection → Cutting to length → Bundling and warehousing

Hot-dip galvanizing process

Hot-dip galvanizing is currently the most mainstream and reliable anti-corrosion method for steel pipes; compared to electro-galvanizing (cold galvanizing), it offers a thicker zinc coating, superior adhesion, and a longer service life regarding corrosion resistance.

Weight calculation

① Calculation formula

Weight per meter (kg/m) = (Outer diameter mm – Wall thickness mm) × Wall thickness mm × 0.02466

② Specifications and weight table

NPS	DN	Schedule No.	OD(mm)	WT(mm)	Weight per meter(kg/m)	6m Weight(kg)
2″	DN50	Custom	60.3	2.5	3.53	21.2
2″	DN50	Custom	60.3	3.0	4.24	25.4
2″	DN50	SCH40	60.3	3.2	4.50	27.0
2″	DN50	Custom	60.3	3.5	4.90	29.4
2″	DN50	Custom	60.3	3.6	5.03	30.2
2″	DN50	SCH80	60.3	4.0	5.55	33.3

The above calculation is based on OD 60.3mm, carbon steel density 7.85g/cm³. Weights shown refer to black bare pipe.

③ Hot-dip Galvanizing Weight Increase Coefficient

Calculated figures apply to uncoated black bare pipe. Estimated finished hot-dip galvanized pipe weight = black pipe weight × coefficient c.

Wall thickness (mm)	Coefficient c
2.0	1.064
2.5	1.051
2.8	1.045
3.2	1.040
3.5	1.036
4.0	1.032

Why Choose Us?

• Large Production Capacity: Own factory with multiple production lines, annual capacity reaches 100,000 tons, capable of stably handling bulk purchase orders of 10-500 tons per batch.

• Quality System: Supports third-party inspections and can organize production according to various global systems, meeting customs clearance and engineering audit requirements in various countries.

• Fair Pricing: We offer factory prices and have a multilingual technical team, providing accurate quotations within 12 hours.

Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE certified factory with an annual output of 100,000 tons. We specialize in producing galvanized pipes of various diameters, including 1”, 1 1/2”, 2”, 3”, 4”, etc., with the best-selling wall thickness SCH40/80. With our high-quality products and services, we export to over 120 countries.