Alloy 4130 Steel Welding Pipe

4130 steel welding Pipe

4130 alloy steel welded tube (4130 Chromoly Welded Tubing) is a high-performance tube made of chromium-molybdenum alloy steel (containing Cr 0.8-1.1%, Mo 0.15-0.25%) through high-frequency resistance welding (ERW) or submerged arc welding (SAW) technology, which has high strength, good toughness and excellent processing economy. The welded tube has a tensile strength of ≥620MPa and a yield strength of ≥415MPa in the quenched and tempered state, and a density of 7.85g/cm³. Its unique chromium-molybdenum alloy composition brings it excellent hardenability and fatigue resistance. After post-weld heat treatment (PWHT), the weld strength can reach more than 90% of the matrix. 4130 welded pipe has a significant cost advantage (about 70% of seamless pipe), and can produce thin-walled pipes with a diameter of 10-800mm and a wall thickness of 1-20mm. It is particularly suitable for applications such as engineering machinery frames (such as crane booms, forklift gantry), transportation equipment (trailer chassis) and medium and low pressure hydraulic systems (≤20MPa) that require lightweight design. In terms of surface treatment, weather resistance can be significantly improved by sandblasting galvanizing or epoxy coating, and the impact energy can still be maintained above 27J in a low temperature environment of -40℃. However, it should be noted that this material is not recommended for high-pressure gas pipelines, and PWHT treatment must be performed under cyclic load conditions and non-destructive testing such as UT/RT must be performed to ensure the structural integrity of the welding area. With its excellent strength-to-weight ratio, forming adaptability and cost-effectiveness, 4130 welded pipe has become an ideal choice for balancing performance requirements and manufacturing costs in the engineering field.

4130 Chromoly Welded Steel Tubing Technical Specifications

Property Category	Detailed Parameters / Description
Standard Dimensions	OD (mm): 10 – 800 (customizable) Wall Thickness (mm): 1.0 – 20.0 Length (m): 6 (standard), max 18 (custom)
Governing Standards	- ASTM A513 (Electric-Resistance Welded) - ASTM A787 (SSAW/HFW Tubes) - EN 10219 (EU Welded) - JIS G3445 (Japan)
Welding Process	⚡️ ERW / HFW / SAW Note: ERW most common for structural tubes
Surface Treatment	- As-welded + Pickling (remove oxide) - Seam Grinding (weld bead removal) - Galvanized (hot-dip/zinc plating) - Powder Coating (architectural use)
Hardness	- Base Material (Q&T): 25-32 HRC - HAZ (Heat Affected Zone): ±10% variance Annealed state: ≤220 HB
Density	7.85 g/cm³
Material Composition	Per ASTM A513: - C: 0.28-0.33% - Cr: 0.80-1.10% - Mo: 0.15-0.25% - S/P ≤0.040% (↑ vs seamless)
Mechanical Properties	Post-Weld Heat Treated (PWHT): - Tensile Strength: ≥620 MPa - Yield Strength: ≥415 MPa - Elongation: ≥10%
Primary Applications	Transport: Trailer frames, forklift masts Construction: Scaffolding, structural trusses Agriculture: Harvester booms, irrigation systems Furniture: High-strength racks, gym equipment

4130 Pipes Chemical Composition:

Grade	C	Si	Mn	S	P	Cr	Ni	Mo
4130	0.28-0.33	0.15-0.35	0.4-0.6	0.025	0.035	0.08-1.10	0.50	0.15-0.25

4130 Welded Pipe Size Chart

Size	ID	OD	Wall Thickness
1	1.049	1.315	0.133
3/4	0.824	1.05	0.113
1 1/4	1.380	1.66	0.140
2	2.157	2.375	0.109
1 1/2	1.610	1.90	0.145
2 1/2	2.635	2.875	0.120
1/2	0.622	0.84	0.109
3 1/2	3.760	4.0	0.120
3	3.260	3.50	0.120
4	4.260	4.5	0.120
6	6.407	6.625	0.109
5	5.187	5.563	0.188

GNEE Group Alloy 4130 Pipe Factory Environment

GNEE Group chromoly Alloy 4130 steel welding Pipe Packaging

GNEE Group chromoly 4130 steel welding Pipe Testing

1. What is 4130 chrome-molybdenum steel used for?
4130 chrome-molybdenum steel (Chromoly) cold-drawn seamless round tube is one of the most widely used steel tubes in the manufacture of racing chassis and roll cages. Its excellent strength-to-weight ratio has been the preferred choice of racing car and aircraft manufacturers since the early 20th century.
2. Is chrome-molybdenum steel better than steel?
What distinguishes chrome-molybdenum steel from other types of steel is its higher tensile strength. This means it can withstand greater forces without breaking or deforming. It also has better corrosion resistance, making it ideal for applications exposed to harsh environments or moisture.
3. Will 4130 chrome-molybdenum steel rust?
Both 4140 and 4130 steels are low-alloy steels that have excellent strength, toughness, and corrosion resistance.
4. Is 4130 a carbon steel?
4130 carbon steel is a low-carbon steel with a carbon content of approximately 0.3%. 4130 is also an alloy steel with chromium and molybdenum as strengthening agents. This steel is easy to weld and can be heat treated more easily than other mild steels.

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