4340 1.6580 30CrNiMo8 SNCM439 Forged Alloy Steel Round Bar

  • group nameAlloy Steel Bars

  • Min Order1 piece

  • brand namefushun

  • model4340 1.6580 SNCM439 30CrNiMo8

  • payment methodT/T, L/C, D/P D/A

  • update timeMon, 16 May 2022 15:50:47 GMT

Paramtents

  • Delivery Condition +N or +A or +QT

  • Surface Condition black or turned or polished

Packging & Delivery

  • Min Order1 piece

Briefing

4340 1.6580 SNCM439 Alloy Steel Round Bar's chemical component and applications.

Detailed

Our supply size :

Diameter : 80 to 600 mm ;

Length : 1000 to 9000 mm ;

 

Our capacity :

Delivery condition : Normalized, or Annealed, or Quenched and Tempered ;

Surface condition : Grounded, or Turned, or Polished

 

Our advantage :

1. High Quality, Reasonable Price

2. Over 40 Years Experience

3. ISO NQA Certificated Factory

4. Worldwide shipping

5. Emergency Orders and Fast Delivery

 

Quality Standard

EN 10277 Bright steel products. Technical delivery conditions. Steels for quenching and tempering

EN 10083 Steels for quenching and tempering. Technical delivery conditions for alloy steels

EN 10269 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

EN 10263 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for steels for quenching and tempering

EN 10250 Open steel die forgings for general engineering purposes. Alloy special steels

ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

 

All Grades Comparison

Material no.

DIN

BS

ASTM

1.6580

30CrNiMo8

823M30

4340

AFNOR

ISO

ГOCT

JIS

30CND8

31CrNiMo8

3KH3M3F

SNCM431

 

Chemical Composition(%)

Steel Grade

C

Mn

Si

P

S

Cr

Ni

Mo

30CrNiMo8

0.26-0.34

0.50-0.80

0.40 max

0.025 max

0.035 max

1.80-2.20

1.80-2.20

0.30-0.50

4340

0.38–0.43

0.60-0.80

0.15-0.35

0.035 max

0.040 max

0.70-0.90

1.65-2.00

0.20-0.30

SNCM431

0.27-0.35

0.60-0.90

0.15-0.35

0.030 max

0.030 max

0.60-1.10

1.60-2.00

0.15-0.30

 

Mechanical Properties

(T=20°C if not differently stated)

Heat treatment state

Diameter(mm)

Rm (Mpa)

Rp0.2 (Mpa)

Fracture elongation A5 (%)

Notch impact energy ISO-V [J]

Hardness (HB)

SOFT ANNEALED

/

844 min

/

/

/

250 max

ISOTHERMAL ANNEALED

/

615-815

/

/

/

183-242

QUENCHED AND TEMPERED

16 max

880-1080

685 min

16 min

40 min

289-347

QUENCHED AND TEMPERED

16-40

930-1080

735 min

16 min

40 min

275-318

QUENCHED AND TEMPERED

40-100

880-1030

685 min

17 min

40 min

261-303

QUENCHED AND TEMPERED

100-250

785-935

635 min

18 min

35 min

233-276

QUENCHED AND TEMPERED

250-500

735-885

590 min

16 min

35 min

218-262

 

Heat Treatment

Annealing: Heat to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.

Hardening: Heat to 830 oC – 860 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

Stress Relieving: Heat to 600 oC – 650 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.

Tempering: Re-heat to 450 oC – 660 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air. N.B. Tempering should be avoided if possible within the range 250 oC – 450 oC due to temper brittleness.

 

Introduce

4340 Steel is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. A very popular, versatile steel. It can be heat-treated to produce a wide range of tensile strength in moderate sections.

 

Application

High voltage bolts and nuts, crankshafts, cam shafts, transmission axles, torsion bars, drive shafts, pump shafts, worm shafts, conveyor rollers, stems, pins, tie rods, clutch discs. Large-mass dies for hot stamping. 4340 Steel is widely used in the aerospace industry for structural parts of flaps assembly, fuselage and landing gear, propeller plane axles.

 

Machinability

4340 steel in the hardened and tempered as supplied condition is still regarded as being readily machinable and operations such as turning and drilling etc. can be carried out satisfactorily using machine manufacturers, recommendations for suitable tool type – feeds and speeds.

 

Welding

Welding of 4340 steel in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on 4340 steel while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 640 oC – 660 oC prior to hardening and tempering.

If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 oC below the original tempering temperature (if known).

 

Mill′s test certificate

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

Nearest port for product export
Tianjin, Qingdao, Shanghai, Huangshi
Delivery clauses under the trade mode
FOB, CFR, CIF, CIP, CPT, DDP, DDU, DAF
Acceptable payment methods
T/T, L/C, D/P D/A
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