STKM 11A Steel Tubes

STKM 11A Steel Tubes

Statistics STKM 11A Steel Tubes

  • Sizes: 6mm – 60mm
  • Wall Thickness: 1mm – 12mm
  • Surface Treatment: Oiled
  • Dimensions: 15.9 x 1.2 – 114.3 x 9.5 mm
  • Application: Hydraulic system, Electric industry

Japan Steel STKM grades as per JIS G3445

Japan Steel STKM grades as per JIS G3445

Table of Content

STKM 11A Steel Tubes Material Specification

STKM 11A Steel Tubes Specification

STKM11A Seamless Steel Tube Sizes
  • 6 – 60mm
STKM 11A, 12b, 13c Welded Steel Tube Wall Thickness
  • 1-12mm
JIS G 3445 Grade STKM 11A Tube Origin
  • Chinese Main Port
STKM 11A Carbon Steel Seamless Tubes Length
  • 1m-12m
Surface Treatment JIS G3345 Grade Stkm11A Low Carbon Steel Tube
  • Oiled
JIS G3445 Carbon Steel Mechanical Tube Standard
  • ASTM A192/A179/A106
  • DIN2391
STKM11A Seamless Steel Tube Forging Technique
  • Cold Drawn
STKM 11A, 12b, 13c Welded Steel Tube Application
  • Petroleum cracking
  • Chemical fertilizer equipment
  • Drawing-oil-equipment
  • Structure purposes
O.D of JIS G 3445 Grade STKM 11A Tube
  • 19.05mm – 114.3mm
Dimensions of STKM 11A Carbon Steel Seamless Tubes
  • 15.9 x 1.2 – 114.3 x 9.5 mm
STKM 11A Steel Tubes Grades
  • STKM 20A
  • STKM 19A
  • STKM 18A
  • STKM 17A
  • STKM 16A
  • STKM 15A
  • STKM 14A
  • STKM 13C
  • STKM 12B
  • STKM 11A

Applications of STKM 11A, STKM 12B, STKM 13C and STKM 19A Welded Steel Tubes

  • Ship-building
  • Liquid service
  • Petroleum cracking
  • Chemical fertilizer equipment
  • Drawing-oil-equipment
  • Structure purposes
JIS G3445 Carbon Steel Mechanical Tubes Manufacturing Method

JIS G3445 Carbon Steel Mechanical Tubes Manufacturing Method

Refer JIS G3445 STKM12A/STKM12B Tube OD Tolerances
Wall Thickness (WT) Tolerances on Wall Thickness (WT)
Under 4mm +0.6 -0.5
4mm or over +15% -12.5%
Under 3mm ±0.3
3mm or over ±10%
Under 2mm ±0.15
2mm or over ±8%

STKM11A Chemical Composition

STKM11A chemical composition

Grade STKM11A STKM12A STKM12B STKM12C STKM13A STKM13B STKM13C STKM14A STKM14B STKM14C
Chemical Composition % C ≤0.12 ≤0.20 ≤0.25 ≤0.30
Si ≤0.35 ≤0.35 ≤0.35 ≤0.35
Mn ≤0.60 ≤0.60 0.30~ 0.9   0.30~ 1  
P ≤0.040 ≤0.040 ≤0.040 ≤0.040
S ≤0.040 ≤0.040 ≤0.040 ≤0.040
Nb or V ▾ — — —

JIS G3445 Grade STKM11A Mechanical Properties

Grade STKM11A STKM12A STKM12B STKM12C STKM13A; STKM13B STKM13C STKM14A STKM14B STKM14C
Mechanical Properties Tensile Strength (MPa)     230 -294 235 -343 240 -392 248 -471 238 -373 245 -441 252 -510 242 -412 251 -500 256 -549
Yield Strength (MPa)     – 218 -177 228 -275 236 -353 222 -216 231 -304 239 -382 225 -245 236 -353 242 -412
Elongation (%) No.11: Specimen 235 235 225 220 230 220 215 225 215 215
Flattening Test Distance between that parts (D=OD) 1/2D 2/3D 2/3D – 2/3D 3/4D – 3/4D 7/8D –
Bending Test Bend Angle     180° 90° 90° – 90° 90° – 90° 90° –
Inside Radius (D=OD)   4D 6D 6D – 6D 6D – 6D 8D –

STKM 11A Steel Tubes Equivalent Material

NUMBER GRADE ASTM NUMBER JIS MECHANICAL
D 3517 Grade 11 A STKM 11 A A513 G-3445 MT1010

Flattening and Bending of JIS G3345 Grade Stkm11A Low Carbon Steel Tube

Flattening Test Bending Test
Distance
between
that parts
(D=OD)		 Bend
Angle		 Inside
Radius
(D=OD)
1/2D 180° 4D

Physical Properties of JIS G 3445 Grade STKM 11A Tube

Properties Values
Density(kg/dm3) 371 (≥)
Thermal conductivity (W/mK) 13
Temperature T (°C/F) 34
Specific heat (J / kgK) 41

STKM 11A Grade Working Temperature Range

Property Value
Temperature range 425 °C

Grades of STKM

Standard
STKM
  • STKM 11A
  • STKM 12B
  • STKM 13C
  • STKM 14A
  • STKM 15A
  • STKM 16A
  • STKM 17A
  • STKM 18A
  • STKM 19A
  • STKM 20A

STKM11A Seamless Steel Tube Testing Methods

STKM11A Seamless Steel Tube Testing Methods

Delivery Condition of JIS G3445 Carbon Steel Mechanical Tube

Designation Symbol
Cold finished (soft) BKW
Cold finished (hard) BK
Cold finished and stress-relieved BKS
Normalized NBK
Annealed GBK

Smelting Temperature of STKM11A Seamless Steel Tube

Property Value
Temperature range 425 °C

JIS G3445 Carbon Steel Mechanical Tube Heat Treatment Techniques

Annealing Quenching Tempering Normalizing Q & T
√ √ √ √ √

JIS G3445 Gr STKM11A Thermal Properties

Properties Values
Temperature (°C) 14 314 937
Modulus of elasticity (GPa) – 281 –
Mean coefficient of thermal expiation ×10-6/(°C) – – 13
Thermal conductivity (W/m·°C) – 31.3 42.2
Specific thermal capacity (J/kg·°C) – 111 –
Specific electrical resistivity (Ω mm²/m) 0.33 – –
Deity (kg/dm³) – – 443
Poisson’s coefficient, ν – – 124

STKM 11A Carbon Steel Seamless Tubes

Property Temperature
Values 1200°F [650°C]

Creep Strength of JIS G 3445 Grade STKM 11A Tube

Creep Strength of JIS G 3445 Grade STKM 11A Tube Method

JIS G3345 Grade Stkm11A Low Carbon Steel Tube Inspection Report

OD.
(mm)		 Tolerance
(mm)		 ID.
(mm)		 Tolerance
(mm)		 Length
(mm)		 Tolerance
(mm)		 Straightness
(mm)
4 ±0.05 1.5 -0/+20 3000 ±0.05 1:1000

Range of STKM11A Seamless Steel Tube

Products Seamless and Welded Pipes/Tubes Plates / Sheets Round Bar Coil / Strip
Dimension OD:6-219mm x WT:0.5-20.0mm 0.08-200mm(T)*W*L Φ8-1200mm*L 0.03-16.0x1200mm

Chemical compatibility of STKM11A material

Media Symbol Compatibility
Acetonitrile (Methyl Cyanide) Acetonitrile (Methyl Cyanide) Excellent
Acetyl Chloride Acetyl Chloride Good
Adipic Acid Adipic Acid Excellent
Alcohol: Isobutyl Alcohol: Isobutyl Good
Allyl Bromide Allyl Bromide Not recommended
Amyl Acetate (Banana Oil) Amyl Acetate (Banana Oil) Fair to Poor
Butyric Acid Butyric Acid Not recommended

STKM11A hardness

Hardness
77 HRB 212 HBW