4140 4130 Steel Round Bar , AISI 4140 Round Bar Black / Peeled Surface

Product Specification

Hot rolled alloy steel round bar

VANFORGE supply hot wrought carbon steel bars, alloy steel bars. Bar applications including forging, heat treating, cold drawing, machining and many structural components.

Materials and Manufacture

1 The steel shall be made by one or more of the following primary processes: basic-oxygen or electric-furnace. The primary melting may incorporate separate degassing or refining and may be followed by secondary melting using electro-slag remelting or vacuum arc remelting. Where secondary melting is employed, the heat shall be defined as all of the cast product remelted from a single primary heat.

2 The steel shall be furnished as strand cast or ingot cast, unless otherwise specified.

Discard—A sufficient discard shall be made to secure freedom from injurious piping and undue segregation.

3 Deoxidation—Killed steel is required.

The purchaser may designate that the steel be made to coarse or fine austenitic grain size.

4 Slow Cooling—Immediately after hot forming, the bars shall be allowed to cool to a temperature below the critical range under suitable conditions to prevent imperfections caused by too rapid cooling.

Ordering Information

Orders under this specification should include the following as required to describe adequately the desired material:

1 Quantity (weight or number of bars),

2 Name of material (hot-wrought alloy steel bars),

3 Dimensions,

4 ASTM designation,

5 Deoxidation practice,

6 Grade designation or chemical composition limits,

7 Grain size if required,

8 Test reports, if required,

9 Additions to the specification and Supplementary Requirements, if required, and

10 Application.

Chemical composition, %, max.

Remarks:

A Small quantities of certain elements are present in alloy steels which are not specified or required. These elements are considered as incidental and may be present to the following maximum amounts: copper 0.35 %, nickel 0.25 %, chromium 0.20 %, and molybdenum 0.06 %.

B Standard alloy steels can be produced with a lead range of 0.15 to 0.35 %. Such steels are identified by inserting the letter “L” between the second and third numerals of the number, that is, 41L40. A cast or heat analysis is not determinable when lead is added to the ladle stream.

C New designation established in accordance with Practice E527.

D Grade designations correspond to the respective AISI and SAE designations. Grade compositions correspond to the respective AISI compositions.

E Where minimum and maximum sulfur contents are shown, it is indicative of resulfurized steel.

F Silicon may be specified by the purchaser as 0.10 % maximum. The need for 0.10 % maximum generally relates to severely cold-formed parts.

G These steels can be expected to contain 0.0005 to 0.003 % boron. If the usual titanium additive is not permitted, the steels can be expected to contain up to 0.005 % boron.

Thermal Treatment

Various thermal treatments such as annealing, stress relief, quench and temper, normalize, etc., are available. Such treatments must be specified as a Supplementary Requirement.

Workmanship

The bars shall be free of pipe, cracks, and flakes. Within the limits of good manufacturing and inspection practices, the bars shall be free of injurious seams, laps, segregation, or other imperfections which due to their nature, degree, or extent, will interfere with the use of the material in machining or fabrication of suitable parts.

Descaling

When descaled bars are required, Supplementary Requirement S12 on Pickling or S13 on Cleaning must be specified.

Axle Shaft Quality

Axle shaft quality applies to hot-rolled steel bars intended for the manufacture of power-driven axle shafts of the automotive or truck type, which by their design or method of manufacture are not machined all over or have less than recommended stock removed for the proper clean-up of normal surface imperfections.

Ball and Roller Bearing Quality and Bearing Quality

This quality applies to steel intended for antifriction bearings.

Cold Shearing Quality

When the bar size exceeds certain limits, it is recommended that cold shearing quality steel be ordered. This quality will provide characteristics which permit cold shearing without cracking. The producer should be consulted in establishing the proper practice.

Cold Working Quality

This classification encompasses bars subject to severe cold plastic deformation such as, but not limited to, upsetting, heading, forging, forward or backward extrusion.

If the type of steel or chemical composition does not have adequate cold working characteristics, appropriate thermal treatments should be specified.

When Supplementary Requirement S1 is specified, the bars shall be produced by manufacturing practices and subjected to mill tests and inspection and freedom from injurious surface imperfections to the extent that the bars shall be suitable for the manufacture of identified parts. The quality requirements of individual application vary.

Aircraft Quality or Magnaflux Quality

These quality designations apply to alloy steels for important or highly stressed parts of aircraft and for other similar or corresponding purposes involving additional stringent requirements, such as magnetic particle inspection, additional discard, macroetch tests (see Method E381), and hardenability control (see Specification A304).

Annealing

The steel shall be furnished annealed.

Spheroidize Annealing

The steel shall be spheroidize annealed.

Stress Relieving

The steel shall be stress relieved by heating to a temperature specified by the purchaser or to a temperature selected by the manufacturer.

Grain Size (Coarse)

The steel shall conform to the coarse austenitic grain size requirement of Specification A29/A29M.

Grain Size (Fine)

The steel shall be killed and shall have austenitic grain size of 5 and finer (fine grain), to be determined in accordance with the comparison procedure in Test Methods E112. The grain structure shall be considered satisfactory when a minimum of the rated grains are 70 % within the specified size limits.

Special Straightness

The bars shall be produced with special straightness (see Specification A29/A29M for tolerances).

Pickling

The surface of the bars shall be descaled by pickling.

Cleaning

The surface of the bars shall be descaled by blast cleaning or other mechanical methods.

Coating

The bars shall be oiled, limed, or phosphate-coated as specified by the purchaser. The purchaser shall also specify the method of cleaning (Supplementary Requirement S12 or S13); otherwise, the bars shall be descaled by pickling or blasting at the manufacturer’s option.

 
Product size range
Diameter: 40mm - 150mm
Length: on request
 
Production Process
 


 
 
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