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Hot Piercing Workshop
Hot Piercing Workshop
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Inspection Workshop

Acid Cleaning Workshop
Acid Cleaning Workshop
ECT-620 Eddy Currentautomatic Test System
ECT-620 Eddy Currentautomatic Test System

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Workshop and equipment in en OCTG base
Workshop and equipment in en OCTG base
Defectoscope
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Weighting and Packing Machine

High-precision CNC threading machine
High-precision CNC threading machine
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Marking Machine

JIS G3454 Carbon steel pipes

JIS G3454 Carbon steel pipes
carbon steel pipeJIS G3454JIS G3454 STPG370JIS G3454 STPG410steel tubesteel tubes 
JIS G3454 standard specifies the carbon steel pipes, hereinafter referred to as the pipes.
Standard:
  • JIS G3454 Carbon steel pipes for pressure service at an approximate maximum temperature of 350 Degrees Celsius.
Size range of JIS G3454 (mm):
  • Outer Dimensions: 19.05mm- 114.3mm
  • Wall Thickness:2.0mm -14 mm
  • Length: max 16000mm
Application:
  • Carbon steel pipes for pressure service
  • High pressure service and high temperature service
Packing:
  • Packing: in bundles
  • Surface: Varnish coating
  • Ends: Beveled or Plain ends with Plastic caps
Inspection & Certification:
  • 1) Certification: ISO, API, ASTM, DIN etc.
  • 2) Mill Test Certificate: EN10204/3.1B
  • 3) Third party inspection: SGS, BV, Lloyds etc.

The main products of steel / steel grade:

  • JIS G3454 STPG370
  • JIS G3454 STPG410
Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
Painting: as requested.

Chemical Compositions(%) of JIS G3454

GradeCSiMnPS
STPG370≤0.25≤0.350.30-0.90≤0.040≤0.040
STPG410≤0.30≤0.350.30-1.00≤0.040≤0.040

Mechanical Properties of JIS G3454

GradeYield Strength (Mpa)Tensile Strength (Mpa)Elongation (%)
JIS G3454 STPG370≥216≥370≥30
JIS G3454  STPG410≥245≥410≥25
Pertaining to the electric-resisitance welded steel tubes, when previously agreed upon with the manufacturer, the purchaser may designate the supplementary quality requirements Z3 or Z4 speified in appendix, in addition to the items specified in this text.

JIS G3462 boiler tubes

JIS G3462 boiler tubes
JIS G3462 boiler tubes
boiler tubeboiler tubesheat exchanger tubesJIS G3462JIS G3462 STB A12JIS G3462 STB A13JIS G3462 STB A24Seamless pipeSeamless Pipesseamless steel tubesSeamless tubeseamless tubessteel tube
JIS G3462  is a JIS standard refers to alloy steel boiler tubes and heat exchanger tubes. This steel tubes is used in carbon steel pipes for tube heat-exchange inside and outside, such as boiler water steel pipe, superheater tube, condenser tube and more.
However, it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

The size range of  JIS G3462 boiler tubes(mm):

  • Outer Dimensions: 19.05mm-168.3mm
  • Wall Thickness:2.0mm-14 mm
  • Length: max 19000mm

Application of JIS G346s seamless tubes:

  • used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc. of boilers, and heat exchanger industries.
  • it is not applicable to the steel tubes for heating furnace and those for heat exchangers for low temperature service.

The main products of steel / steel grade:

  • JIS G3462 STB A12
  • JIS G3462 STB A13
  • JIS G3462 STB A24

Corresponding to international standards

  • ISO 9329-2:1997 Seamless steel tubes for pressure purposes-Technical delivery conditions-Part 2: Unalloyed and alloyed steels with specified elevated temperature properties.
  • ISO 9330-2:1997 Welded steel tubes for pressure purposes-Technical delivery conditions-Part 2: Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated temperature properties.

Delivery Condition:

  • Heat treatment,Annealed, Normalized, Normalized and Tempered

Surface treatment:

  • Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting
  • Painting as requested.

Chemical composition of JIS G3462 heat exchanger tubes(%):

GradeCSiMnPSCrMo
JIS G3462 STB A120.10~0.200.10~0.500.30~0.80<0 td><0 td>0.45~0.65
JIS G3462 STB A130.15~0.250.10~0.500.30~0.80<0 td><0 td>0.45~0.65
JIS G3462 STB A24<0 td><0 td>0.30~0.60<0 td><0 td>1.90~2.600.87~1.10

Mechanical behavior of JIS G3462 heat exchanger tubes (%):

Gradetensile strength kgf/mm²{N/mm²}yield strength kgf/mm²{N/mm²}
JIS G3462 STB A12<39{382}<21{206}
JIS G3462 STB A13<42{412}<21{206}
JIS G3462 STB A24<42{412}<21{206}

Tolerance on Outside Diameter in JIS G3462

O.D.TOLERANCE ON OUTSIDE DIAMETER
HOT ROLLED SEAMLESS PIPESSEAMLESS PIPES THROUGH QUENCH AND NORMALIZEDCOLD DRAWN SEAMLESS PIPES THRONG, THE HOT TREATMENT EXCEPT QUENCH AND NORMALIZEDELECTRIC WELDED PIPES EXCEPT COLD DRAWNCOLD DRAWN ELECTRIC WELDED PIPES
MM
< td>+0.4
-0.8
±0.25±0.10±0.15±0.10
<25.40±0.25±0.15±0.20±0.15
<40-50±0.25±0.20±0.25±0.20
<50.60±0.25±0.25±0.30±0.25
<60-80±0.30±0.30±0.40±0.30
<80.100±0.40±0.40-0.60,+0.40±0.40
<100-120+0.4
-1.2
-0.60,+0.40-0.60,+0.40-0.80,+0.40-0.60,+0.40
<120-160-0.80,+0.40-0.80,+0.40-1.00,+0.40-0.80,+0.40
<160-200-1.8,+0.4-1.20,+0.40-1.20,+0.40-1.20,+0.40-1.20,+0.40
<200-2.4,+0.4-1.60,+0.40-1.60,+0.40-1.60,+0.40-1.60,+0.40

Tolerance on Wall Thickness in JIS G3462

WALL
THICKNESS
(MM)
HOT ROLLED SEAMLESS PIPECOLD DRAWN SEAMLESS PIPEELECTRIC WELDED PIPE
O.D(MM)O.D(MM)O.D(MM)
< td><100< td><40< td><40
(%)
< td>---0,+0.4mm+22
-0
-0,+0.3mm+18
0
<2-2.4-0,+40-+20
-,0
+18
-0
<2.4-3.8-0,+35-0,+35
<3.8-4.6-0,+23-0,+33
<4.6-0,+28-0,+28

Tolerance on the Length in JIS G3462

ITEMTOLERANCE AN LENGTH
OD<50mm td><7m td>-0, +7mm
<=7mEvery 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD<=50mm<7m td>-0, +10mm
<=7mEvery 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD: Outside Diameter

JIS G3455 Seamless tubes for high pressure service

JIS G3455 Seamless tubes for high pressure service
JIS G3455 Carbon steel pipes for high pressure service at an approximate maximum temperature of 350oC.

Standard:

JIS G3454
JIS, Japanese Industrial Standards specifies the standards used for industrial activities in Japan.

Size range of JIS G3454 (mm):

  • Outer Dimensions: 19.05mm- 114.3mm
  • Wall Thickness:2.0mm -14 mm
  • Length: max 16000mm

Application:

  • Carbon steel pipes for pressure service
  • High pressure service and high temperature service

Packing:

  • Be packed in Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .
  • Surface: Varnish coating
  • Ends: Beveled or Plain ends with Plastic caps
  • Painting: as requested.

Inspection & Certification:

1) Certification: ISO, API, ASTM, DIN etc.
2) Mill Test Certificate: EN10204/3.1B
3) Third party inspection: SGS, BV, Lloyds etc.

The main products of steel / steel grade:

  • JIS G3455 STS370
  • JIS G3455 STS410
  • JIS G3455 STS480

Chemical Compositions(%) of JIS G3455

Standard / GradeCSiMnPS
JIS G3455 STS370≤0.250.10-0.350.30-1.10≤0.035≤0.035
JIS G3455 STS410≤0.300.10-0.350.30-1.40≤0.035≤0.035
JIS G3455 STS480≤0.330.10-0.350.30-1.50≤0.035≤0.035

Mechanical Properties of JIS G3455

Standard / GradeYield Strength (Mpa)Tensile Strength (Mpa)Elongation (%)
JIS G3455 STS370≥216≥370≥30
JIS G3455 STS410≥245≥410≥25
JIS G3455 STS480≥275≥480≥25

Tolerance on Outside Diameter and Wall Thickness in JIS G3455

APPLICATIONTOLERANCE ON OUTSIDE DIAMETERTOLERANCE ON WALL THICKNESS
Hot Rolled
Seamless Pipes
< mmtd>±0.5mm< mmtd>±0.5mm
<50-160mm±1%
<160-200mm±1.6mm<4mm±12.5%
<200mm±0.8%
More that 350mm, the
Tolerance is ±0.5%
Cold Drawn
Seamless Pipes
and Electric Resistant
Welded Pipes
< mmtd>±0.3mm< mmtd>±0.2mm
<40mm±0.8%<2mm±10%
More than 350 mm the
Tolerance is ±0.5%

JIS G3441 Alloy Steel Tubes for General Structural Purpose

JIS G3441 Alloy Steel Tubes for General Structural Purpose
JIS G3441JIS G3441 SCM415TKJIS G3441 SCM418TKJIS G3441 SCM420TKJIS G3441 SCM430TKJIS G3441 SCM435TKJIS G3441 SCM440TKJIS G3441 SCr420TKsteel tubesteel tubes 
JIS G3441 alloy steel tubes are widely used in mechanical structure, natural gas, oil, water transportation, chemical fertilizer equipment with boiler ect.

Application of  JIS G3441 alloy steel tubes:

mechanical structure, natural gas, oil, water transportation, chemical fertilizer equipment with boiler, petroleum cracking, geological drilling, oil drilling, etc.

Quality Standard and Steel Grade:

  • JIS G3441 SCr420TK
  • JIS G3441 SCM415TK
  • JIS G3441 SCM418TK
  • JIS G3441 SCM420TK
  • JIS G3441 SCM430TK
  • JIS G3441 SCM435TK
  • JIS G3441 SCM440TK

Size range of JIS G3441 Alloy Steel Tubes:

Tolerance on Outside Diameter in JIS G3441
O.D.(mm)Tolerance(%)
<13 td>±0.25
<13-25±0.40
<25-40±0.60
<40-65±0.80
<65-90±1.00
<90-140±1.20
<140By agreement
Tolerance on Wall Thickness in JIS G3441
W.T.(mm)Tolerance
< td>-0.5,+0.6
<4-12.5%, +15%
How to test JIS G3441 Alloy Steel Tubes:
  • Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation)
  • Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc)
  • Exterior Size Inspection.
  • Mill Test Certificate:EN 10204/3.1B
  • Delivery Condition:BKS, NBK,BK ,BKW, GBK(+A), NBK(+N), BK(+C)

JIS G3441 Alloy Steel Tubes Chemical composition Limits(%)

Steel gradeSteel grade(old)CSiMnPSCrMo
SCr420TK0.18~0.230.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM415TK0.13~0.180.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM418TK0.16~0.210.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM420TK0.18~0.230.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM430TKAs STKS10.33~0.380.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM435TKAs STKS30.33~0.380.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30
SCM440TK0.38~0.430.15~0.350.60~0.85<0 td><0 td>0.90~1.200.15~0.30

 Packing:

  • Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips
  • Two tags on each bundle
  • Wrapped in waterproof paper
  • PVC sleeve, and sackcloth with several steel strips

JIS G3429 Seamless steel tubes

JIS G3429 Seamless steel tubes

JIS G3429seamless steel tubeseamless steel tubes, JIS G3429 STH11, JIS G3429 STH12, JIS G3429 STH21, JIS G3429 STH22

JIS G3429 standard specifies the seamless steel tubes, hereinafter referred to as the tube used for the manufacture of seamless steel gas cylinders specified in JIS B8230 and JIS B8241.
Application: Seamless Steel Tubes in High Pressure Gas Cylinder
Standards: JIS G3429
Size range (mm):
  • Outer Dimensions: 19.05mm ~ 114.3mm
  • Wall Thickness:2.0mm ~ 14 mm
  • Length: max 16000mm
The main products of steel / steel grade:
  • JIS G3429 STH11
  • JIS G3429 STH12
  • JIS G3429 STH21
  • JIS G3429 STH22
Packing:
  • Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
  • Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
Delivery:
  • Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
  • Weight of bundle-up to 5000 kg upon request of customer.
  • Each bundle is furnished with three tags.
Chemical Compositions(%)
GradeCSiMnPSNiCrMo
STH11≤0.500.10-0.35≤1.80≤0.035≤0.035///
STH120.30-0.410.10-0.351.35-1.70≤0.030≤0.030///
STH210.25-0.350.15-0.350.40-0.90≤0.030≤0.030≤0.250.80-1.200.15-0.30
STH220.33-0.380.15-0.350.40-0.90≤0.030≤0.030≤0.250.80-1.200.15-0.30

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