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China factory - JIANGSU MITTEL STEEL INDUSTRIAL LIMITED

JIANGSU MITTEL STEEL INDUSTRIAL LIMITED

  • China,Wuxi ,Jiangsu
  • Verified Supplier
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  3. Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6

  1. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
  2. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
  3. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
  4. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
  5. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6
  6. China Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6

Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6

  1. MOQ： 1 Ton
  2. Price： US $950-1,056 / Ton
  3. Get Latest Price
Diameter 13 - 300mm
Length 6m or custom
Grade 4340 Alloy Steel
Surface Treatment Polished
Carbon Content 0.38-0.43%
Silicon Content 0.15-0.35%
Manganese Content 0.60-0.80%
Phosphorus Content ≤0.035%
Sulfur Content ≤0.04%
Nickel Content 1.65-2.00%
Chromium Content 0.70-0.90%
Molybdenum Content 0.20-0.30%
Tensile Strength 1282 MPa (186 ksi)
Yield Strength 862 MPa (125 ksi)
Hardness 363 HB

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  1. Product Details
  2. Company Details

Product Specification

Diameter 13 - 300mm Length 6m or custom
Grade 4340 Alloy Steel Surface Treatment Polished
Carbon Content 0.38-0.43% Silicon Content 0.15-0.35%
Manganese Content 0.60-0.80% Phosphorus Content ≤0.035%
Sulfur Content ≤0.04% Nickel Content 1.65-2.00%
Chromium Content 0.70-0.90% Molybdenum Content 0.20-0.30%
Tensile Strength 1282 MPa (186 ksi) Yield Strength 862 MPa (125 ksi)
Hardness 363 HB
High Light Polished Surface Alloy Steel Round Bar ，Mold Steel Application 4340 Alloy Steel Bar ，OD 6-630mm Steel Round Bar
SAE AISI4340 Alloy Steel Round Bar
High-strength 4340 alloy steel round bars available in diameters from 13mm to 300mm, ready for immediate delivery from stock.
Diameter Range
13 - 300mm
Standard Length
6m or custom cutting
Steel Grade
4340 Alloy Steel
Available Standards
GB, ASTM, JIS, EN, DIN
Material Overview
AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel that combines deep hardenability with high ductility, toughness, and strength. This material offers excellent fatigue resistance, creep resistance, and maintains good strength retention at high temperatures without significant softening.
Chemical Composition
ASTM Standard Steel Grade C Si Mn P (≤) S (≤) Ni Cr Mo Notes
ASTM A29/A29M 4340 (UNS G43400) 0.38-0.43 0.15-0.35 0.60-0.80 0.035 0.04 1.65-2.00 0.70-0.90 0.20-0.30 Steel Bars, Carbon and Alloy, Hot-Wrought
Mechanical Properties
Condition Tensile Strength MPa (ksi), ≥ Yield Strength MPa (ksi), ≥ Elongation in 50 mm, ≥ Reduction in Area, %, ≥ Hardness, HB, ≤
Normalized at 870°C (1600°F) 1282 (186) 862 (125) 12.2 36.3 363
Annealed at 810°C (1490°F) 745 (108) 470 (68) 22.0 50.0 217
Oil quenched & tempered at 540°C (1000°F) 1207 (175) 1145 (166) 14.2 45.9 352
Applications
SAE AISI 4340 steel is ideal for heavy-duty applications requiring exceptional strength under severe conditions. Common uses include:
  • Bolts, screws, and high-strength fasteners
  • Gears, pinions, and mechanical shafts
  • Engine crankshafts and piston rods
  • Aircraft landing gear and structural components
  • Available as billet, bar, forging, sheet, pipe, and welding wire
International Equivalents
US Standard European Union China Japan ISO
4340 (UNS G43400) SAE AMS6414 GB/T 3077 40CrNi2Mo JIS G 4053 SNCM439 -
Company Capabilities
As a leading steel storage and processing company, we maintain extensive inventory with over 30 steel grades and 800+ sizes in stock across 4 warehouses. Our processing services include cutting, polishing, and heat treatment to meet your specific requirements.
Available Steel Grades
We stock a comprehensive range of popular steel grades including EN series, SAE/AISI standards, BS970, DIN specifications, GOST standards, and various ASTM grades to meet diverse industrial requirements.
Product Gallery
Steel round bar inventory and storage facility 4340 alloy steel round bars in various diameters Close-up view of 4340 steel bar surface finish Steel bar processing and quality control Packaged steel bars ready for shipment

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Distributor/Wholesaler,Exporter

  • Total Annual:

    >1000000

  • Employee Number:

    >100

  • Ecer Certification：

    Verified Supplier

Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...

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Get in touch with us

  • Reach Us
  • JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
  • No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
  • https://www.stainless-strips.com/

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