AISI/SAE 4340 Alloy Steel Bar
AISI 4340 carbon steel bar is made of a heat treatable low alloy steel containing chromium, nickel and molybdenum. It has high toughness and high strength under heat treatment conditions.
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Product Description

AISI/SAE 4340 Alloy Steel Bar Description

AISI 4340 is a commonly used alloy steel with high strength, high toughness, good wear resistance and corrosion resistance. Its moderate carbon content gives it good machinability and weldability. In addition, it also contains appropriate amounts of chromium, nickel and other elements, which further improves its performance. At the same time, its toughness and ductility are also quite good, and it can maintain good performance even in both high or low temperature environments. Due to the excellent physical and mechanical properties of 4340 steel, 4340 steel bars are also widely used in equipment manufacturing in corrosive environments such as petroleum, chemical industry, and ships.


Product Parameters

Product Name

AISI/SAE 4340 Alloy Steel Bar

Standard

EN/DIN/JIS/ASTM/BS/ASME/AISI, etc.

Common Round Bar Specifications

3.0-50.8 mmOver 50.8-300mm

Flat Steel Common Specifications

6.35x12.7mm, 6.35x25.4mm, 12.7x25.4mm

Hexagon Bar Common Specifications

AF5.8mm-17mm

Square Bar Common Specifications

AF2mm-14mm, AF6.35mm9.5mm, 12.7mm, 15.98mm, 19.0mm, 25.4mm

Length

1-6meters, Size Accept Custom

Diameter(mm)

Hot Rolling Round Bar

25-600

Cold Rolling Square Bar

6-50.8

Hot Rolling Square Bar

21-54

Cold Rolling Hexagon Bar

9.5-65

Cold Rolling Round bar

6-101.6

Forged Rebar

200-1000

Surface Process

Bright, Polished, Black

Other Services

Machining(cnc), Centerless Grinding(cg), Heat Treatment, Annealing, Pickling, Polishing, Rolling, Forging, Cutting, Bending, Small Machining, etc.

 

Chemical Composition

Grade

Mn

S

C

P

Si

Cr

Ni

AISI 4340

0.60-0.80

0.035

0.38-0.43

0.04

0.15-0.35

0.70-0.90

1.65-2.00

 

Mechanical Properties

Grade

Tensile Strength kg f/mm2

Yield Strength kg f/mm2

Elongation %

Hardness HB

AISI 4340

≥ 100

≥ 90

≥ 16

293-352

 

Scope of Application

AISI 4340 alloy steel is mainly used for power transmission gears and shafts, aircraft landing gear and other structural parts.

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Product Application

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Packaging and shipping

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Factory Display

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FAQ

Q1: What types of steel products does your company primarily manufacture and supply?
A: We are a direct manufacturer specializing in carbon steel, hot-dip galvanized steel, PPGI (pre-painted galvanized iron), and stainless steel (grades 201, 304, and 316) in the form of sheets, coils, pipes, and various structural profiles, along with complementary steel structural components. Our products serve a wide range of industries, including infrastructure, photovoltaics, machinery manufacturing, chemicals, and new energy.

 

Q2: Do you support customization regarding material grades, thicknesses, and dimensions?
A: Customization is available across our entire product range. For carbon steel, galvanized steel, and stainless steel, we can adjust thickness, width, and cut-to-length dimensions according to GB, ASTM, or EN standards. Various profiles can be cut and bent based on customer drawings, and special steel grades can be produced through customized scheduling.

 

Q3: What is the difference between galvanized steel and color-coated (PPGI) steel, and how should I choose for my project?
A: Hot-dip galvanized steel features a pure zinc anti-rust layer; it is cost-effective and impact-resistant, making it ideal for mounting brackets, guardrails, and load-bearing factory structures (and it can be painted over). PPGI color-coated steel uses a galvanized base, offering both rust protection and aesthetic appeal with a wide range of colors; it is commonly used for factory roofing, wall cladding, and energy storage equipment casings. We recommend thicker galvanized coatings for projects in rainy coastal areas, color-coated sheets for outdoor projects requiring visual appeal, and weather-resistant fluorocarbon (PVDF) coatings for high-temperature desert environments.

 

Q4: Does the factory keep stock on hand, and what is the minimum order quantity (MOQ)?
A: We operate our own standardized, zoned warehouse with a capacity of over 10,000 tons, maintaining ample stock of carbon steel, galvanized steel, and stainless steel. The MOQ for standard specifications is 1 ton, though we also accept sample orders as small as a few dozen kilograms. There is no upper limit for large-scale projects, and we support mixed-load shipments combining different steel products in a single container.

 

Q5: What are the lead times for stock items versus customized products?
A: Standard stock items take 3–7 days for processing, packaging, and container loading. Simple cutting and bending orders take 7–10 days. Orders requiring mold creation or special steel customization take 15–30 days; exact delivery dates are confirmed based on the customer's specific order specifications.

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