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Introduction
ISO
9330-3 specifies technical delivery conditions for electric resistance welded
(ERW) and induction welded steel tubes intended for pressure applications where
specified low-temperature properties are required.
The
standard covers circular welded tubes manufactured from unalloyed and alloyed
steels, with specified requirements for chemical composition, mechanical
properties, impact toughness, heat treatment, dimensions and testing.
For
commercial supply, Ladhani Metal Corporation offers ISO 9330-3 welded steel
tubes in the required grades, sizes and lengths as per customer specifications.
Applicable Standard
- ISO 9330-3:1997
- Title: Welded steel tubes for
pressure purposes – Technical delivery conditions – Part 3: Electric
resistance and induction welded unalloyed and alloyed steel tubes with
specified low temperature properties.
- Edition: First edition, 1997
- Current ISO listing: The 1997
edition was reviewed and confirmed in 2012 and remains the current
published edition.
Scope
ISO
9330-3 covers:
- Electric resistance welded steel
tubes.
- Induction welded steel tubes.
- Circular cross-section tubes.
- Unalloyed and alloyed steels.
- Tubes with specified
low-temperature toughness.
- Wall thickness up to and including
16 mm.
- Tubes intended for low-temperature
piping systems.
For
boilers and pressure vessels, ISO 5730 is referenced separately.
Steel Grades Covered
ISO
9330-3 includes unalloyed and alloyed low-temperature pressure tube grades.
Unalloyed Steel Grades
|
Grade |
Steel Type |
|
PL 21 |
Unalloyed
steel |
|
PL 23 |
Unalloyed
steel |
|
PL 25 |
Unalloyed
steel |
|
PL 26 |
Unalloyed
steel |
Alloyed Steel Grades
|
Grade |
Steel Type |
|
11MnNi5-3 |
Manganese-nickel
alloy steel |
|
13MnNi6-3 |
Manganese-nickel
alloy steel |
|
12Ni14 |
Nickel
alloy steel |
|
X12Ni5 |
Nickel
alloy steel |
These are
the grades specified in the ISO 9330-3 material requirements.
Chemical Composition
The
chemical composition is based on heat analysis. The following values are
specified by ISO 9330-3:1997.
PL Series – Unalloyed Steels
|
Grade |
C max. % |
Si max. % |
Mn % |
P max. % |
S max. % |
Al total min. % |
|
PL 21 |
0.17 |
0.35 |
0.40–1.00 |
0.030 |
0.025 |
0.015 |
|
PL 23 |
0.19 |
0.35 |
0.60–1.20 |
0.030 |
0.025 |
0.015 |
|
PL 25 |
0.17 |
0.35 |
0.60–1.20 |
0.030 |
0.025 |
0.015 |
|
PL 26 |
0.20 |
0.35 |
0.80–1.40 |
0.030 |
0.025 |
0.015 |
Alloy Steel Grades
|
Grade |
C max. % |
Si max. % |
Mn % |
P max. % |
S max. % |
Al total min. % |
Ni % |
V max. % |
Nb max. % |
|
11MnNi5-3 |
0.14 |
0.50 |
0.70–1.50 |
0.030 |
0.025 |
0.020 |
0.30–0.80 |
0.05 |
0.05 |
|
13MnNi6-3 |
0.18 |
0.50 |
0.85–1.65 |
0.030 |
0.025 |
0.020 |
0.30–0.80 |
0.05 |
0.05 |
|
12Ni14 |
0.15 |
0.35 |
0.30–0.85 |
0.025 |
0.020 |
— |
3.25–3.75 |
0.05 |
— |
|
X12Ni5 |
0.15 |
0.35 |
0.30–0.80 |
0.025 |
0.020 |
— |
4.50–5.30 |
0.05 |
— |
- For 11MnNi5-3 and 13MnNi6-3, the
specified nickel range may be modified for certain wall thickness
conditions according to the standard.
- Elements not specified in the
chemical composition table should not be intentionally added without
purchaser agreement, except where permitted for steelmaking/deoxidation
purposes.
Mechanical Properties
The
mechanical properties are specified at room temperature and depend on the grade
and reference heat treatment.
|
Grade |
Heat Treatment |
Tensile Strength MPa |
Yield / Proof Strength MPa |
Elongation min. % |
|
PL 21 |
N |
360–480 |
215 |
24 |
|
PL 23 |
N |
410–530 |
235 |
22 |
|
PL 25 |
Q + T |
360–490 |
255 |
21 |
|
PL 26 |
N |
460–580 |
265 |
21 |
|
11MnNi5-3 |
N |
410–530 |
285 |
22 |
|
13MnNi6-3 |
N |
490–610 |
355 |
20 |
|
12Ni14 |
Q + T |
440–590 |
245 |
16 |
|
X12Ni5 |
Q + T |
510–710 |
390 |
17 |
- N = Normalizing
- Q + T = Quenching and Tempering
Low Temperature Impact Properties
Low-temperature
impact toughness is one of the principal requirements of ISO 9330-3.
- Charpy V-notch impact testing is
specified.
- Impact testing is performed at
designated low temperatures according to the grade.
- Longitudinal test pieces are
specified as the standard orientation.
- Transverse impact test pieces may
be used by agreement.
- The standard specifies minimum
average impact values based on three test pieces.
- Individual values are subject to
the minimum limits specified by the standard.
Manufacturing Process
ISO
9330-3 tubes are produced by electric resistance welding or induction welding.
Typical
manufacturing steps include:
- Steelmaking and controlled chemical
composition.
- Production of strip or plate
feedstock.
- Forming into circular tubular
shape.
- Electric resistance or induction
welding.
- Heat treatment according to grade.
- Sizing and finishing.
- Non-destructive and mechanical
testing.
- Cutting to specified lengths.
- Final inspection.
The
steels intended for tubes covered by the standard are fully killed steels.
Manufacturing Conditions
Depending
on the grade and ordered condition, tubes may be supplied as:
- Hot-finished tubes.
- Cold-finished tubes.
- Normalized tubes.
- Quenched and tempered tubes.
- ERW tubes.
- Induction welded tubes.
The
applicable heat-treatment condition is dependent on the grade requirements.
Heat Treatment
ISO
9330-3 includes heat-treatment conditions such as:
- Normalizing (N).
- Quenching and tempering (Q + T).
The
required condition depends on the individual steel grade and
mechanical-property requirements.
Dimensions and Tolerances
The
standard specifies requirements for outside diameter, wall thickness, length
and mass.
- Outside diameters and wall
thicknesses are selected from the dimensional ranges of ISO 4200 and ISO
1129.
- Outside diameter tolerance: ±0.75%,
with a minimum of ±0.35 mm.
- Wall thickness tolerance: ±10%,
with a minimum of ±0.20 mm.
- Tubes may be supplied in random
lengths or specified exact lengths according to the order.
Surface Condition
The tubes
are supplied with suitable internal and external surface conditions.
- Surfaces should be suitable for
inspection.
- Small imperfections may be
permitted where the wall thickness remains within the specified tolerance.
- Larger surface imperfections may be
dressed where permitted, provided the finished wall thickness remains
within the required limits.
- Weld areas are subject to the
applicable inspection requirements.
Welded Tube Characteristics
ISO
9330-3 is specifically applicable to ERW and induction welded tubes.
Key
characteristics include:
- Longitudinal welded construction.
- No filler metal in the
resistance/induction welding process.
- Controlled weld quality.
- Suitable mechanical properties
after specified heat treatment.
- Low-temperature impact toughness
requirements.
- Pressure-service suitability.
Forms of Supply
- ERW steel tubes.
- Induction welded steel tubes.
- Low-temperature pressure tubes.
- Welded pressure tubes.
- Hot-finished welded tubes.
- Cold-finished welded tubes.
- Cut-to-length tubes.
- Custom-size tubes on order basis.
Applications
ISO
9330-3 welded tubes are intended for pressure and low-temperature service
applications such as:
- Low-temperature piping systems.
- Pressure piping.
- Process piping.
- Petrochemical piping.
- Oil and gas processing systems.
- Cold-service piping.
- Industrial process equipment.
- Low-temperature fluid transportation.
- Engineering and energy
installations.
Key Features
- Electric resistance and induction
welded construction.
- Designed for pressure applications.
- Specified low-temperature
toughness.
- Unalloyed and alloyed steel grades.
- Controlled chemical composition.
- Defined tensile and yield
properties.
- Charpy impact requirements.
- Normalized and
quenched-and-tempered conditions.
- Suitable for demanding
low-temperature piping service.
- Available in customized dimensions
and lengths as required.
Availability
ISO
9330-3 welded steel tubes are available on order basis in the specified grades,
dimensions, wall thicknesses, lengths and heat-treatment conditions.
Customized
requirements can be supplied according to project specifications, drawings and
purchase requirements.
Conclusion
ISO
9330-3 provides technical delivery requirements for electric resistance and
induction welded steel tubes with specified low-temperature properties. Its
PL-series and alloyed grades are designed for pressure piping systems where
controlled mechanical properties and low-temperature toughness are important.
To place an order or enquiry
for ISO 9330-3 welded steel tubes, contact Ladhani Metal Corporation.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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