4340 Bar Suppliers in India | 4340 Round Bar Price List India
Reliant Pipes & Tubes Pvt. Ltd.

4340 Bar Suppliers in India | 4340 Round Bar Price List India

4340 Bar Suppliers in India | 4340 Round Bar Price List India

4340 Bar Suppliers in India | 4340 Round Bar Price List India

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Table Of Content


AISI 4340/JIS SNCM439 Alloy Steel Bar

4340 alloy steel round bar is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.


AISI 4340 alloy steel round bar Similar Grades

  • Standard: GB/AISI/JIS
  • Grade: 40CrNiMoA/4340/SNCM439

AISI 4340 alloy steel round bar Available Size

  • Hot rolled round bar: dia16mm-dia310mm
  • Hot rolled flat bar: thickness5mm-30mm, width50mm-130mm
  • Hot rolled square bar: 16mm*16mm-100mm*100mm
  • Forged steel round bar: dia100mm-dia1500mm
  • Forged flat bar: thickness20mm-400mm, width80mm-1000mm
  • Forged steel block: 100mm*100mm-1000mm*1000mm
  • Cold drawn round bar: dia4mm-dia100mm

Heat Treatment

Annealing/Normalizing/Hardening/Tempering/Quenching

  • Annealing: AISI 4340 round bar alloy steel is annealed at 844°C (1550°F) followed by cooling the furnace.
  • Tempering: AISI 4340 round bar alloy steel should be in the heat treated or normalized and heat treated condition before tempering. Tempering temperatures depend upon the desired strength level.
  • Hardening: AISI 4340 round bar alloy steel can be hardened by cold working or heat treatment.

4340 STEEL BAR, ROD & WIRE

4340 alloy steel bar is used heavily in the aerospace industry due to its ultra-high strength. When heat treated it is known for its toughness while preserving good fatigue strength. For highly stressed parts it is excellent choice. It can be machined by all customary methods. This material is available in both vacuum melt (VM) and air melt (AM).

4340 ROUND BAR STOCK
Reliant Pipes is a distributor of 4340 round bar stock in cold finished form. Our team works with you to ensure you get 4340 alloy round bar that meets your exact specifications and needs.

Reliant Pipes is a mill quality producer and supplier of steel bar and wire products. Based in Mumbai (India), we have warehouse locations in seven major cities across the India. Our team is dedicated to providing quality product with excelent customer service at a competitive price.

Applications:

  • Aircraft Landing Gear
  • Power Transmission Gears
  • Structural Use Applications
Typical Chemical Properties
Minimum Properties Tensile Strength , psi 140,000
  Yield Strength, psi 120,000
  Elongation 14%
  Hardness Rc 32/39
Chemistry Carbon( C) .38 -.43%
  Chrome (Cr) 0.70- 0.90%
  Manganese (Mn) 0.60-0.80%
  Molybdenum (Mo) 0.20 - .30%
  Nickel ( Ni) 1.65-2.0%
  Phosphorus (P) 0.030%
  Sulphur (S) 0.040%
  Silicon (Si) 0.15- 0.35%

An iron-based alloy steel, 4340 contains nickel, chromium and molybdenum

4340 Alloy Steel can be heat treated to achieve high strength whilst maintaining good toughness, wear resistance and fatigue strength levels, combined with strength up to 315 ºC.

INVENTORY

PRODUCT FORM SIZE RANGE FROM SIZE RANGE TO
4340 Round bar 30 mm 160 mm

CHEMICAL ANALYSIS

% FE NI CR MN C MO SI S P
Min 95.195 1.65 0.70 0.60 0.37 0.20 0.15 - -
Max 96.33 2 0.90 0.80 0.43 0.30 0.30 0.04 0.035

APPLICATIONS

4340 Alloy Steel can be used in a variety of applications, here are just a few examples:

  • Commercial and military aircraft
  • Automotive systems
  • Forged hydraulic systems

ABOUT 4340 ALLOY STEEL

4340 Alloy Steel is an iron-based alloy containing nickel, chromium and molybdenum. The relatively high carbon content provides this alloy with superior strength in applications where severe service conditions exist.

4340 Alloy Steel has high strength, superior toughness and good ductility. In addition, the alloy is immune to embrittlement.

PROPERTIES

Density: 7.85 g/cm^3
Melting Range:1340-1380°C
Specific Heat Capacity:448 J/kg*K
Electrical Resistivity:1.09 µΩ.m
Coefficient of Thermal
Expansion from -18-93°C:11.3 µm/mm/°C
Coefficient of Thermal Expansion from -18-649°C:14.6 µm/mm/°C

ROOM TEMPERATURE MECHANICAL & PHYSICAL PROPERTIES AT VARIOUS TEMPERING TEMPERATURE (NORMALISED AT 899-927 °C/AUSTENITISED AT 816-829°C/OIL QUENCHED) 204°C 260°C 316°C 427°C 538°C 593°C 649°C
Ultimate Tensile Strength /MPa 1905 1830 1140
0.2% Yield Strength /MPa 1530 1530 1035
Reduction of area % 35 25 60
Elongation % 11 8 18
Room Temperature Hardness/ Rockwell C at Various Tempering Temperature (Austenitised at 843°C/Oil Quenched/Tempered Twice for 2+2 Hours) 52 47 41 35 25

 

MECHANICAL & PHYSICAL PROPERTIES 21.1°C 100°C 204.4°C 315.6°C 400°C 537.8°C 648.9°C 700°C 760°C 815°C 870°C 982°C
Ultimate Tensile Strength /MPa 792 - - - - 726 473 - 286 - 139 66
0.2% Yield Strength /MPa 407 - - - - 363 275 - 152 - 68 31
Reduction of area % - - - - - - - - - - - -
Elongation % 31 - - - - 27 32 - 75 - 90 91
1,000 hr Rupture Strength - - - - - - 83 47 26 15 8.3 -
Coefficient of Thermal Expansion /µm/m°C ** - 11 12.7 13.4 13.9 14.3 15 15.4 - 16.5 17.1 18.2
Thermal Conductivity /kcal/(hr.m.°C) ** 10.06 - - - - - - - - - - -
Modulus of Elasticity / GPa 221 216 210 203 197 190 181 173 - 165 153 140

HARDNESS/ ROCKWELL C AT VARIOUS TESTING TEMPERATURE 21 °C 93°C 204°C 316°C 427°C 538°C
Condition A: Normalised at 899 °C for 1 hour + air cool/ Austenitised at 816 °C for 0.5 hour + oil quench/ Tempered at 246 °C for 2+2 hours +air cool 49 48.5 48 45.5 35 18
Condition B: Normalised at 899 °C for 1 hour + air cool/ Austenitised at 816 °C for 0.5 hour + oil quench/ Tempered at 482 °C for 2+2 hours +air cool 40.5 38 36.5 34 31.5 18
Condition C: Normalised at 899 °C for 1 hour + air cool/ Austenitised at 802 °C for 0.5 hour + oil quench/ Tempered at 593 °C for 2 hours +air cool 34 32.5 30 27.5 24 13

4340 STEEL BAR SIZES

Title Type/Filesize

4140    

W-Nr 1.7225, AS 4140, BS EN19A, AISI 4140   
Cr Mo steel for applications requiring high tensile strength and toughness values, in particular in medium and large cross sections in the quenched and tempered condition.

Size Range:

Rd 10mm - 650mm, Hollow 45/28 - 200/140mm,
Hex 19 - 75mm A/F
Sq 28mm - 127mm
Fl 76.2x38.1mm
Chrome Bar 19.05mm - 101.6mm
Ground 12.7mm - 110mm (H9 Toll)
Peeled & Polished 19.05mm - 101.6mm (H11 Toll).

Other size available on request

709M

W-Nr 1.7225, AS 4140, BS EN19A, AISI 4140
When compared to other 4140 steels ASSAB 709M has guaranteed superior machinability characteristics in all sizes.

Size Range:
Rd 16mm - 250mm

Other sizes available on request.

4340    

W-Nr 1.6565, AS 4340, BS ~EN24, AISI 4340   
Ni Cr Mo steel for applications requiring high tensile strength and toughness values, particularly in large cross sections in the quenched and tempered condition.

Size Range:
Rd 17mm-460mm

Other sizes available on request.

EN-25    

W-Nr 1.6743, AS X9931, BS EN25   
21/2% Ni Cr Mo alloy steel with increased strength due to the Ni content. Supplied in the hardened and tempered condition.

Size Range:
Rd 7.94mm- 260mm
Sq 300mm

Other sizes available on request.

EN26    

W-Nr 1.6745, AS X9940, BS 970 826 M 40   
21/2% Ni Cr Mo alloy steel with higher C content. Supplied in the hardened and tempered condition. Higher strength than EN25.

Size Range:
Rd 25mm - 300mm

Other sizes available on request.

4145H    

AISI 4145H Mod.API Spec.7   
45% C Cr Mo alloyed steel normally used in oil field pplications.

Size Range:
Rd 90mm - 280mm
Hollow 180/57.15 - 254/76.2

Other sizes available on request


Aircraft Quality 4340 per 6359 Hot Rolled Plate

SAE 4340 Chromoly steel is ideal for parts requiring critical harden-ability and high strength metal. For example, gears and aircraft parts which operate under highly stressed, severe conditions perform exceptionally when made from 4340 AQ metal. The term Aircraft Quality (AQ) steel means it is suitable for the manufacturing of aircraft parts which are subject to magnetic particle inspection after machining.

AMS 6359 - AISI 4340 (E4340) Aircraft Quality Steel Plate Size Table

SIZE
INCHES
WGT./
SQ.FT.
18" x 72"
ANNEALED
36" x 72"
ANNEALED
72" x 144"
ANNEALED
0.190 7.945 HR HR HR
1/4 10.20 HR HR HR
5/16 12.75 HR HR HR
3/8 15.30 HR HR HR
1/2 20.40 HR HR HR
5/8 25.50 HR HR HR
3/4 30.60 HR HR HR
7/8 35.70 HR HR HR
1 40.80 HR HR HR
1 1/4 51.00 HR HR HR
1 1/2 61.20 HR HR HR
1 3/4 71.40 HR HR HR
2 81.60 HR HR HR
2 1/2 102.00 HR HR HR
3 122.40 HR HR HR
3 1/2 142.80 HR HR HR
4 163.20 HR HR HR
4 1/2 183.50 HR HR HR
5 204.00 HR HR HR
6 244.83 HR HR HR
  • Material may also meet specs ASTM-A829, AMS-2301, EN10204.


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