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AISI 1018 SAE UNS G10180 Carbon Steel Foundry

Steel foundry in China for producing AISI 1018 SAE UNS G10180 Carbon Steel castings. The followings are this material's chemical composition, physical and mechanical properties and equivalent material grades.

The following sections will discuss in detail about AISI 1018 carbon steel.

Chemical Composition

The chemical composition of AISI 1018 carbon steel is outlined in the following table.

Element

Content (%)

Manganese, Mn

0.60-0.90

Carbon, C

0.15-0.20

Sulfur, S

0.05 (max)

Phosphorous, P

0.04 (max)

Iron, Fe

Balance

Physical Properties

The physical properties of AISI 1018 carbon steel are tabulated below.

Properties

Metric

Imperial

Density

7.87 g/cm3

0.284 lb/in3

Mechanical Properties

The following table shows mechanical properties of cold drawn AISI 1018 carbon steel.

Properties

Metric

Imperial

Tensile strength

440 MPa

63800 psi

Yield strength

370 MPa

53700 psi

Modulus of elasticity

205 GPa

29700 ksi

Shear modulus (typical for steel)

80 GPa

11600 ksi

Poisson’s ratio

0.29

0.29

Elongation at break (in 50 mm)

15%

15%

Hardness, Brinell

126

126

Hardness, Knoop (converted from Brinell hardness)

145

145

Hardness, Rockwell B (converted from Brinell hardness)

71

71

Hardness, Vickers (converted from Brinell hardness)

131

131

Machinability (based on AISI 1212 steel. as 100 machinability)

70

70

Thermal Properties

The thermal properties of AISI 1018 carbon steel are given in the following table.

Properties

Metric

Imperial

Thermal conductivity

51.9 W/mK

360 BTU in/hr.ft2.°F

Other Designations

Other designations that are equivalent to AISI 1018 carbon steel include the following.

AMS 5069

ASTM A29

ASTM A512

ASTM A611 (D-1)

ASTM A635

AMS 5069A

ASTM A510

ASTM A794

ASTM A519

ASTM A544

ASTM A108

ASTM A513

ASTM A830

ASTM A545

ASTM A548

ASTM A549

ASTM A659

SAE J412

SAE J1397

MIL S-11310 (CS 1018)

ASTM A576

SAE J403

SAE J414

MIL J-1397

MIL J-403

Fabrication and Heat Treatment

Machinability

AISI 1018 carbon steel is rated at 62% of AISI 1112 carbon steel. Machining provides this alloy with a fine finish, with continuous and hard chips. It is possible to machine this alloy in all conditions.

Forming

It is easy to form AISI 1018 carbon steel in the annealed condition.

Welding

AISI 1018 carbon steel can be welded using most of the conventional methods such as gas, oxyacetylene, resistance, and submerged melt welding.

Heat Treatment

AISI 1018 carbon steel can be case hardened to Rc 42, but only in thin sections. In case of thicker sections of over 4 in., Rc 28-30 can be obtained.

Forging

Forging of AISI 1018 carbon steel can take place in the range of 996-1260°C (1825-2300°F).

Hot Working

AISI 1018 carbon steel can be easily hot worked.

Cold Working

Cold working AISI 1018 carbon steel will affect the hardness and mechanical properties. Intermediate annealing has to be performed to overcome the alloy’s tendency to work harden.

Annealing

Complete annealing of this alloy can be achieved by soaking at 899°C (1650°F) followed by furnace cooling. Process annealing can be done at 649°C (1200°F).

Applications

AISI 1018 carbon steel is commonly used in high volume screw machine parts applications. The other applications of this alloy are as follows:

Shafts

Spindles

Pins

Rods

Sprocket assemblies.

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