STKM13C material properties

STKM13C material properties

It is a carbon steel material which is known for strength and versatility for use in different applications. It displays excellent weldability properties which makes it appropriate for manufacturing processes such as welding, bending and forming it into different shapes without losing its structural strength. Altogether it is reliable to use and therefore it is used in industries such as automotive and construction.

STKM13C Chemical composition


JIS G3445 Grade STKM13C Tubes are easy to form and shape, Check Mechanical Properties

STKM13C Tubes are easy to form and shape which means that it is primarily appropriate for bending, welding and forming it into various shapes without creating any difficulties for the material. This property makes ease in the fabrication process which makes lower labour cost, and potential to make complex construction with accuracy. These properties are highly expected by engineers to work for their projects.

In the mechanical properties where, its tensile stress 539 (≥) Rm (MPa) denotes that it has the ability to resist stretching or pulling without breaking. This property is important where structural strength and load-hold abilities are required.

In yield strength properties the ratio is 488 (≥) Rm (MPa), which means that it can resist significant loads without damaging the material. This makes it suitable for industries which need structural strength and resistance from damage while load holding and properties are appropriate for automotive, machinery and construction purposes.

CNS STKM13C Mechanical Properties

Tensile Stress
Rm (MPa)
Yield Stress
Rp0.2 (MPa)
A (%)
KV/Ku (J)
539 (≥) 488 (≥) 21 22

STKM13C Steel Physical properties

Modulus of elasticity
Thermal conductivity
Specific thermal capacity
364 979 31.3 142

STKM13C equivalent material

  • GB/T 8713 GB/T 3639 20#
  • ASTM A519 Grade 1020
  • EN 10305-1 E355+SR
  • ISO 683-1 C20E4
  • DIN 2391 ST52 BK+S

CNS STKM13C used for machinery and automobiles, Refer Heat Treatment

The chemical elements of STKM13C makes it applicable for machinery and automobiles. In machinery applications it is useful for structural elements as it gives strength and durability to it. It gives trusted support to and encounters heavy loads and pressure while giving stability and performance of the machinery. Whereas in automobiles its durability in corrosion and ability to resist high temperature makes it applicable for this application, it gives durability and safety to vehicle construction.

Heat Treatment of JIS G3445 STKM13C

Heat Treatment 1491°C – 1554°C

Creep strain limit of CNS STKM13C

Creep strain limit (10000h)

STKM13C Steel contains upto 0.25% carbon, View Operating Temperature

STKM13C, consisting 0.25% carbon, gives strength and ductility. It increases the hardness and tensile strength of the material which makes it more immune to wear and gives the ability to prevent higher pressure.

Operating Temperature of STKM13C Material

Operating Temperature 743 °C

STKM13C Steel Grade Hardness

HBS 546~175
HRC 30

JIS STKM13C Application

  • Furniture
  • Machinery
  • Bicycles
  • Automobiles
  • Appliances
Refer JIS G3445 STKM13C material product range

These are the diverse forms which STKM13C allows to be used in a broad range of manufacturing and industrial applications which gives versatility and reliability in their project.

Range of products of JIS G3445 STKM13C

Products Dimensions
Plates/Sheets 0.08-200mm(T)*W*L
Steel Bar 8-1200mm*L
Strip / Coil 0.03-16.0x1200mm
Seamless / Welded Pipes OD:6-219mm x WT:0.5-20.0mm
View JIS G3445 Grade STKM13C Manufacturing process

STKM13C Manufacturing process

Forging of STKM13C is done typically at the temperature range i.e. between 2012⁰F – 2192⁰F, while in the process it is heated at this temperature to make it moldable and then it is shaped in desired shape under high pressure. Complete control of temperature is important so as to avoid any damage to the material.

Hot rolling process involves heating STKM13C to high temperature i.e. between 2000⁰F to 2400⁰F. At this temperature the material becomes malleable and this moment it can be easily shaped. Then it is passed through rollers to reduce its thickness to achieve the wanted size for the application.

Cold rolling process gives strength and hardness through stress hardening at the same time maintain smooth surface and finish.

Casting of STKM13C includes melting the material at the temperature range of 2597⁰F and 2804⁰F. This process includes melting the steel in the burner until it arrives at liquid state within the given temperature range. And once it gets fully melted it is poured into moulds to convert it into a desired shape.

JIS STKM13C Manufacturing process

  • Forging
  • Hot rolling
  • Cold rolling
  • Cast
  • Cold-Rolled
  • Hot-Rolled
  • Hot extrusion
JIS STKM13C Manufacturing process

Delivery condition of JIS G3445 Grade STKM13C

  • Annealed
  • Solution and Aging
  • Quenched and Tempered
  • Acid Washed
  • Shot Blasting
  • Rough Turning
JIS G3445 Grade STKM13C Delivery condition

Tolerance on Outside Diameter of STKM 13C material

Div Tolerances on the OD
No. 1 Under 50mm ±0.5mm
50mm or over ±1%
No. 2 Under 50mm ±0.25mm
50mm or over ±0.5%

Tolerance on Thickness of CNS STKM13C

Size Tolerance
Under 4mm +0.6mm to  -0.5mm
4mm or over -12.50% to 15%

STKM 13C Steel process performance

Steel Grade Machinability Weldability Hardenability Cold Formability
STKM 13C Good Excellent Low Good

Features of JIS STKM13C

  • High dimensional accuracy
  • Excellent surface finish
  • Good ductility
  • Versatile and adaptable