Specifications

1.Chemical composition

 Grade C Si Mn P S
 JIS STKM13C 0.25max 0.35max 0.30〜0.90 0.040max 0.040max

 SKK

original

standards

SKCY510 0.25max 0.35max 0.30〜0.90 0.040max 0.040max
SKCY540 0.17〜0.25 0.35max 0.30〜0.90 0.040max 0.040max
SKCY590 0.17〜0.25 0.35max 0.60〜0.90 0.040max 0.040max
SKCY690 0.17〜0.22 0.80max 1.65max 0.035max 0.035max

 

2.Mechanical properties

Grade 

Tensile strength

(N/mm2)

Yield point

(N/mm2)

Elongation

(%)

JIS 

STKM13C

510min

380min

15min

SKK

original

standards

SKCY510

510min

380min

15min

SKCY540

540min

430min

15min

SKCY590

590min

490min

15min

SKCY690

690min

590min

15min

 

3.Tolerances for dimensions (mm)

Inside diameter

Tolerance for 

inside

 diameter

 Wall thickness

Tolerance for

 wall thickness 

length

 〜50

+0.20 

+0.50 

 〜10

 ±10%

 〜6,000

 51〜80

+0.20 

+0.60 

 〜10

 〜8,000

 81〜120

+0.30 

+0.80 

 〜15

 〜10,000

 121〜160

+0.40 

+1.00 

 〜20

 〜10,000

 161〜200

+0.60 

+1.00 

 〜20

 〜10,000

 201〜260

+0.80 

+1.00 

 〜20

 〜10,000