Grade

C

Si

Mn

P

S

Cr

Mo

STB 340

≤0.18

≤0.35

0.30-0.60

≤0.035

≤0.035

/

/

STB 410

≤0.32

≤0.35

0.30-0.80

≤0.035

≤0.035

/

/

STB 510

≤0.25

≤0.35

1.00-1.50

≤0.035

≤0.035

/

/

STB A22

≤0.15

≤0.50

0.30-0.60

≤0.035

≤0.035

0.80-1.25

0.45-0.65

STB A23

≤0.15

0.50-1.00

0.30-0.60

≤0.030

≤0.030

1.00-1.50

0.45-0.65

Grade

Yield Strength (Mpa)

Tensile Strength
(Mpa)

Elongation (%)

STB 340

≥175

≥340

≥35

STB 410

≥255

≥410

≥25

STB 510

≥295

≥510

≥25

STB A22

≥206

≥412

≥30

STB A23

≥206

≥412

≥30

JIS G3461

ASTM

ASME

BS

DIN

ISO

ABS

NK

LRS

DNV

STB 340

A178

SA178 A

3059-P1 320

17175 st 35.8

ABS D

KSTB 33

Sec 6 320

Sec 4-E-TS360

STB 410

A178 C

SA178 C

3059-P2 440

17175 st 45.8

ABS F

KSTB 42

Sec 6 410

Sec 4-E-TS410-1

STB 510

17175 19Mn 5

Sec 4-E-TS510

Symbol of class

Heat treatment

Hot finished seamless steel tube

Cold finished seamless steel tube

Electric resistance welded steel tube other than hot finished or cold finished steel tube

Finished electric resistance welded steel tube

Fold finished electric resistance welded steel tube

STB 340

As manufactured, as required, low temperature annealing or normalizing may be performed.

Low temperature annealing, normalizing or full annealing.

Normalizing

As manufactured. However, as required, low temperature annealing or normalizing may be performed.

Normalizing

STB 410

As manufactured. However, as required, low temperature annealing or normalizing may be performed.

Low temperature annealing, normalizing or full annealing.

Normalizing

Low temperature annealing

STB 510

Normalizing

Tolerances

Division of wall
thickness (mm)

Division of method of manufacture

Hot finished seamless steel tube

Cold finished seamless steel tube

Electric resistance welded steel tube

Division of outside diameter (mm)

Under 100

100 or over

Under 40

40 or over

Under 40

40 or over

Tolerances on wall thickness %

Under 2

---

---

+0.4mm

+22



0

+0.3

+18



0

0

0

2 or over to and excl. 2.4

+40

---

+20



0

+18



0

0

2.4 or over to or excl. 3.8

+35

+35

0

0

3.8 or over to or excl. 4.6

+33

+33

0

0

4.6 or over

+28

+28

0

0

Tolerances  on
thickness disparity%

---

Within 22.8 of wall thickness

---

---

Division of outside diameter

Tolerances on outside diamete

 Hot finished seamless steel tube

Cold finished seamless steel tube

Electric resistance welded steel tube other than cold finished

Cold  finished  electric resistance welded steel tube

Under 25

+0.4

-0.8

【0.10

【1.5

【0.10

25 or over to and excl. 40

【0.15

【0.20

【0.15

40or over to and excl. 50

【0.20

【0.25

【0.20

50 or over to and excl 60

【0.25

【0.30

【0.25

60 or over to and excl. 80

【0.30

【0.40

【0.30

80 or over to and excl. 100

【0.40

+0.40

【0.40

-0.60

100 or over to and excl.12

+0.4

-1.2

+0.40
-0.60

+0.40
-0.80

+0.40

-0.60

120 or over to and excl.160

+0.40
-0.80

+0.40
-1.00

+0.40

-0.80

160 or over to and excl.200

+0.4

+0.40

+0.40

+0.40

-1.8

-1.20

-1.20

-1.20

200 or over

+0.4

+0.40

+0.40

+0.40

-2.4

-1.60

-1.60

-1.60

Division

Tolerance on length

50 mm or under in
outside diameter

7 m or under in length

+0.7 mm

0

Over 7 m in length

Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15 mm.

Over  50  mm  in
outside diameter

7 m or under in length

+10mm

0

Over 7 m in length

Add 3 mm to the plus side permissible deviation given above for each increase of 3m or its fraction in length. However, the maximum value shall be 15mm.