AISI 4130 Alloy Steel Round Forged Bar for Oil and Gas

Description

1. Quick Overview – AISI 4130 Forged Bar

AISI 4130 forged bar is a chromium-molybdenum low-alloy steel with excellent overall performance. It achieves a good balance between strength, toughness, weldability, and machinability. It holds an important position in industrial manufacturing, being particularly suitable for producing critical components that must withstand high stress and impact.TIPTOP do specialized in 4145H Mod/4330V/4130/bars and forgings for many years. For normal sizes,we usually have stock and could shorten delivery time.

2.Do you know the common chemical composition and mechanical properties of AISI 4130?

Typical Chemical Composition and Mechanical Properties of AISI 4130

 

Element	C	Mn	Si	Cr	Mo	P	S	NI
Ratio	0.26 – 0.34	0.40-0.70	0.15-0.35	0.80-1.10	0.15-0.25	≤ 0.035	≤ 0.040	≤ 0.030

Mechanical Properties (Quenched & Tempered condition, e.g., per API 6A 75K and similar standards):

Tensile strength (σb) ≥ 655 MPa

Yield strength (σ0.2) ≥ 517 MPa

Elongation (δ) ≥ 18%

Hardness ≤ 229 HB

Toughness (impact energy) ≥ 37 J

3. Common Sizes

Bars: 3 – 1200 mm diameter; length typically 0.5 to 6 meters, but can be supplied as required.

We also can produce and supply forged plates and tubes

4.4130 Forged Bar Main Heat Treatment Processes

Mainly Quenching and Tempering (Quenching + High-Temperature Tempering)

In addition, production conditions and processes directly affect dimensional range and accuracy. The following are the main production processes for 4130 bar stock:

Hot working: including hot rolling and hot forging, suitable for producing large-size, thick products.

Cold working: such as cold drawing and cold rolling, resulting in high dimensional accuracy and good surface finish, but usually limited to smaller sizes.

Accuracy grade: For high dimensional accuracy requirements, cold drawing/cold rolling (e.g., H11 tolerance) can be selected, or further finishing (e.g., grinding, turning, etc.) can be performed to obtain high-precision round/fine round bars with an outer diameter tolerance of ±0.02mm and a straightness of 0.30/1000mm.

Supply status: Products can be delivered in various states, such as black skin, bright round, ground, sandblasted, etc. This not only affects the delivery cycle but also directly relates to whether further processing is required.

5. Why choose 4130 forged bars?

High strength and high toughness

Excellent hardenability

Good corrosion resistance

6.What are the main applications of 4130 forged bars as semi-finished products?

Oil & Gas industry: Valves (valve bodies), pump bodies, Christmas trees, pipe connectors, flanges, etc.

Energy & heavy industry: Gearbox components and main shafts for wind turbines, flanges for power stations, etc.

General machinery & tooling: Spindles, lead screws, high-load gears, and other large mechanical parts.

API Wellhead products: Christmas tree (oil well), High-pressure swivel joint, Choke valve / Throttle valve, Slab gate valve, Spacer flange / Raising flange, Cross / Four-way fitting,Casing head, Plug valve, Union, Tubing head,  Check valve

7. Our Advantages to produce 4130 Forged bars

Forging capabilities

We own various free forging equipment, ranging from 5‑ton and 8‑ton electro-hydraulic hammers to 2000‑ton and 2500‑ton high-speed forging presses.

Heat treatment

We have 5 sets of heat treatment quenching lines and a fully equipped physical & chemical laboratory, ensuring full control from heat treatment to quality inspection.

Machining equipment

Large and medium-sized deep hole drilling & boring machines, internal honing machines, CNC heavy-duty lathes, CNC gantry mills, machining centers, and cylindrical grinders enable precision finishing of long shafts up to 12 meters, solving difficult slender shaft machining challenges.

Standard delivery lead time

Typically 30–40 days, meeting the requirements of most conventional projects.

Inspection equipment and methods

Equipped with NDT equipment such as ultrasonic and magnetic particle inspection; we provide multi‑dimensional quality data reports including chemical analysis, mechanical property testing, and metallographic examination.

Strict compliance with standards

Products are manufactured in strict accordance with international standards such as ASTM (USA), GB (China), EN (Europe), etc.