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Introduction
ISO
9330-5 specifies technical delivery conditions for submerged arc-welded steel
tubes intended for pressure applications where specified low-temperature
properties are required.
The
standard covers circular tubes manufactured from unalloyed and alloyed steels,
with requirements for chemical composition, mechanical properties, impact
toughness, heat treatment, dimensions and inspection.
For
commercial supply, Ladhani Metal Corporation offers ISO 9330-5 welded steel
tubes in the required grades, dimensions, lengths and delivery conditions.
Applicable Standard
- ISO 9330-5:2000
- Title: Welded steel tubes for
pressure purposes – Technical delivery conditions – Part 5: Submerged
arc-welded unalloyed and alloyed steel tubes with specified low
temperature properties.
- Edition: First edition, June 2000.
- Status: Published and current; ISO
states that this edition was last reviewed and confirmed in 2012.
Scope
ISO
9330-5 covers:
- Submerged arc-welded steel tubes.
- Circular cross-section tubes.
- Unalloyed and alloyed steels.
- Tubes with specified
low-temperature properties.
- Tubes intended for pressure
purposes.
- Applications where the material is
also used as part of a low-temperature piping system.
- Longitudinal or helical submerged
arc-welded tubes.
For
pressure-containing equipment, ISO 5730 is referenced, while general technical
delivery requirements are covered by ISO 404.
Steel Grades Covered
ISO
9330-5 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 |
|
X10Ni9 |
Nickel
alloy steel |
The grade
listings are supported by ISO 9330-5 references in comparative steel-standard
data.
Chemical Composition
The
chemical composition is based on heat analysis. The following values are
specified for the principal grades covered by ISO 9330-5.
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 |
0.40–1.00 |
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 |
0.30–0.80 |
0.025 |
0.020 |
0.020 |
3.25–3.75 |
0.05 |
— |
|
X12Ni5 |
0.15 |
0.35 |
— |
0.025 |
0.020 |
— |
4.50–5.30 |
0.05 |
— |
The
standard also specifies permissible deviations for product analysis where a
check analysis is required.
Mechanical Properties
The mechanical
and technological properties are specified at room temperature and depend on
the steel grade, wall thickness and reference heat-treatment condition.
|
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 |
480–580 |
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 |
|
X10Ni9 |
Q + T |
690–840 |
Grade/thickness dependent |
Grade/thickness dependent |
- N = Normalizing
- Q + T = Quenching and Tempering
- Mechanical requirements can vary
with wall thickness and the applicable grade condition.
Low Temperature Impact Properties
Low-temperature
impact toughness is an important requirement of ISO 9330-5.
- Charpy V-notch impact testing is
specified.
- Testing is carried out at
temperatures appropriate to the individual grade.
- Longitudinal impact specimens are
used where specified.
- Transverse testing may be
applicable according to the standard and order requirements.
- Minimum impact-energy requirements
depend on grade and test temperature.
- Nickel-alloyed grades are intended
for particularly demanding low-temperature service.
The exact
impact temperature and energy requirements should be confirmed against the
ordered grade, dimensions and test orientation.
Manufacturing Process
ISO
9330-5 tubes are manufactured by submerged arc welding.
Typical
manufacturing steps include:
- Steelmaking with controlled
chemical composition.
- Production of flat-rolled steel
feedstock.
- Forming of the flat product into
tubular shape.
- Submerged arc welding.
- Internal and external welding runs.
- Heat treatment over the full tube
length.
- Sizing and finishing.
- Mechanical and non-destructive
testing.
- Cutting to specified lengths.
- Final inspection.
The
standard requires the steels to be fully killed. Tubes may be longitudinally or
helically welded, and the submerged arc process requires at least one internal
and one external welding run.
Manufacturing Conditions
Depending
on the ordered grade and requirements, tubes may be supplied as:
- Submerged arc-welded tubes.
- Longitudinally welded tubes.
- Helically welded tubes.
- Hot-finished tubes.
- Cold-finished tubes.
- Normalized tubes.
- Normalized and tempered tubes.
- Quenched and tempered tubes.
The tubes
are supplied heat-treated over their full length according to the applicable
grade requirements.
Heat Treatment
ISO
9330-5 specifies heat-treatment conditions according to the type of steel.
Typical
conditions include:
- Normalizing (N).
- Normalizing and tempering.
- Quenching and tempering (Q + T).
Examples
of specified conditions include normalizing for PL 21, PL 23 and PL 26, while
PL 25 is supplied in the quenched-and-tempered condition.
Dimensions and Tolerances
The
standard provides requirements for tube dimensions, masses and tolerances.
- Tube dimensions are related to the
applicable dimensional standards.
- Outside diameter and wall thickness
are controlled according to the specified tolerances.
- Length requirements are agreed
according to the order.
- Tubes can be supplied in standard
or specified lengths.
- Dimensional inspection is carried
out as part of final product verification.
ISO
9330-5 references ISO 4200 for applicable tube dimensions and includes specific
dimensional, mass and tolerance requirements in its technical delivery
conditions.
Surface Condition
The tubes
are supplied with suitable internal and external surface conditions.
- Surfaces should permit effective
visual and dimensional inspection.
- Surface imperfections are
controlled so that the required wall thickness remains within
specification.
- Defects may be removed by suitable
dressing where permitted.
- The finished surface must remain
compliant after any permitted dressing operation.
- Weld seams are subject to
applicable inspection requirements.
Forms of Supply
Ladhani
Metal Corporation can supply ISO 9330-5 tubes in forms such as:
- Submerged arc-welded steel tubes.
- SAW pressure tubes.
- Longitudinally welded tubes.
- Helically welded tubes.
- Low-temperature pressure tubes.
- Alloy steel welded tubes.
- Carbon steel welded tubes.
- Hot-finished tubes.
- Cold-finished tubes.
- Cut-to-length tubes.
- Custom-size tubes on order basis.
Applications
ISO
9330-5 welded steel tubes are suitable for pressure and low-temperature
applications such as:
- Low-temperature piping systems.
- Pressure piping.
- Petrochemical plants.
- Oil and gas processing.
- Process piping.
- Energy and power projects.
- Cryogenic and cold-service systems.
- Industrial fluid transportation.
- Low-temperature process equipment.
- Engineering and infrastructure
projects.
Key Features
- Submerged arc-welded construction.
- Designed for pressure purposes.
- Specified low-temperature properties.
- Unalloyed and alloyed steel grades.
- Fully killed steel.
- Full-length heat treatment.
- Controlled chemical composition.
- Defined mechanical properties.
- Charpy impact toughness
requirements.
- Longitudinal or helical welding
options.
- Suitable for demanding
low-temperature piping applications.
Conclusion
ISO
9330-5 provides technical delivery requirements for submerged arc-welded
unalloyed and alloyed steel tubes with specified low-temperature properties.
The standard is intended for pressure applications where the material is also
required to perform as part of a low-temperature piping system.
To place an order or enquiry
for ISO 9330-5 welded steel tubes, contact Ladhani Metal Corporation.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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