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DIN 28181 Welded Steel Tubes – Application & Technical
Specifications
Introduction
DIN 28181 covers straight
welded steel tubes with plain ends for tubular heat exchangers used
predominantly in process engineering plants. The current DIN 28181:2007-09
edition covers welded tubes made from non-alloy, alloy, and stainless steels
and specifies dimensions, materials, and dimensional requirements.
DIN 28181 welded steel tubes
are suitable for heat exchangers, condensers, process equipment, chemical
plants, petrochemical facilities, power generation systems, and industrial
heat-transfer applications.
Ladhani Metal Corporation is
a manufacturer, supplier, and exporter of DIN 28181 Welded Steel Tubes,
supplying tubes in various grades, sizes, wall thicknesses, surface finishes,
and customized dimensions worldwide.
Applicable Standard
Standard Specification: DIN
28181:2007-09
Organization: Deutsches
Institut für Normung (DIN)
Title: Welded Steel Tubes for
Tubular Heat Exchangers – Dimensions and Materials
The current edition replaced DIN 28181:1985-08. The older grades St
37.0, St 37.8, and TTSt 35 N were removed; St 37.8 was replaced by P235GH, TTSt
35 N by P215NL, and 16Mo3 was newly introduced.
Forms of Supply
• Welded Steel Tubes
• Welded Heat Exchanger Tubes
• Tubular Heat Exchanger Tubes
• Condenser Tubes
• Carbon Steel Tubes
• Alloy Steel Tubes
• Stainless Steel Tubes
• Straight Length Tubes
• Plain End Tubes
• Custom Cut Tubes
Grades Covered Under DIN 28181
P235GH | P215NL | 16Mo3 |
X5CrNi18-10 | X5CrNiMo17-12-2 | X6CrNiMoTi17-12-2 | X6CrNiTi18-10
Supply Condition
• Welded Condition
• Annealed Condition
• Normalized Condition
• Solution Annealed Condition
• Heat Treated Condition
• Cold Finished Condition
• Fabrication-Ready Condition
Surface Finish
• Mill Finish
• Bright Finish
• Pickled Finish
• Passivated Finish
• Polished Finish
• Smooth Finish
• Cold Finished Surface
Standard Sizes
Welded Steel Tubes
Outside Diameter: 10 mm to
610 mm
Wall Thickness: 0.5 mm to 25
mm
Length: Up to 12 meters
Custom outside diameters,
wall thicknesses, lengths, end conditions, and surface finishes are available
according to customer requirements.
Chemical Composition of DIN 28181- (1985)
The chemical composition
varies according to the selected material grade.
|
Grade |
C
% |
Si
% |
Mn
% |
P
% |
S
% |
Cr
% |
Ni
% |
Mo
% |
Ti
% |
|
P235GH |
≤0.16 |
≤0.35 |
0.60–1.20 |
≤0.025 |
≤0.010 |
— |
— |
≤0.30 |
— |
|
P215NL |
≤0.16 |
≤0.35 |
0.40–0.80 |
≤0.025 |
≤0.010 |
— |
— |
— |
— |
|
16Mo3 |
≤0.20 |
0.10–0.35 |
0.40–0.90 |
≤0.025 |
≤0.010 |
≤0.30 |
≤0.30 |
0.25–0.35 |
— |
|
X5CrNi18-10 |
≤0.07 |
≤1.00 |
≤2.00 |
≤0.045 |
≤0.030 |
17.0–19.5 |
8.0–10.5 |
— |
— |
|
X5CrNiMo17-12-2 |
≤0.07 |
≤1.00 |
≤2.00 |
≤0.045 |
≤0.030 |
16.5–18.5 |
10.0–13.0 |
2.0–2.5 |
— |
|
X6CrNiMoTi17-12-2 |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.045 |
≤0.030 |
16.0–18.0 |
10.5–13.5 |
2.0–2.5 |
5×C–0.70 |
|
X6CrNiTi18-10 |
≤0.08 |
≤1.00 |
≤2.00 |
≤0.045 |
≤0.030 |
17.0–19.0 |
9.0–12.0 |
— |
5×C–0.80 |
Mechanical Properties of DIN 28181
|
Grade |
Tensile Strength MPa |
Yield Strength MPa |
Elongation % |
|
P235GH |
360–500 |
≥235 |
≥25 |
|
P215NL |
360–510 |
≥215 |
≥25 |
|
16Mo3 |
440–590 |
≥280 |
≥22 |
|
X5CrNi18-10 |
500–700 |
≥200 |
≥40 |
|
X5CrNiMo17-12-2 |
500–700 |
≥200 |
≥40 |
|
X6CrNiMoTi17-12-2 |
520–720 |
≥200 |
≥40 |
|
X6CrNiTi18-10 |
500–700 |
≥200 |
≥40 |
Mechanical requirements
depend on the selected material, tube dimensions, delivery condition, and
applicable technical delivery standard referenced by DIN 28181.
Key Features of DIN 28181 Welded Steel Tubes
• Excellent heat-transfer
performance
• Reliable welded construction
• Good mechanical strength
• High dimensional accuracy
• Good pressure resistance
• Good corrosion resistance depending on grade
• Excellent fabrication characteristics
• Suitable for heat exchanger applications
• Long service life
• Available in non-alloy, alloy, and stainless steel grades
Applications of DIN 28181 Welded Steel Tubes
Heat Exchanger Industry
• Tubular Heat Exchangers
• Shell and Tube Heat Exchangers
• Heat Recovery Equipment
• Process Heat Exchangers
• Cooling Systems
Chemical & Petrochemical Industry
• Process Equipment
• Chemical Processing Plants
• Petrochemical Equipment
• Condensers
• Process Cooling Systems
Power Generation Industry
• Heat Exchanger Systems
• Condenser Equipment
• Cooling Systems
• Boiler Auxiliary Equipment
• Thermal Process Equipment
Oil & Gas Industry
• Process Heat Exchangers
• Refinery Equipment
• Hydrocarbon Processing Systems
• Cooling Equipment
General Industrial Applications
• Process Engineering
Equipment
• Industrial Heat Transfer Systems
• Fluid Heating Systems
• Industrial Cooling Equipment
• Engineering Equipment
Fabrication and Welding
DIN 28181 welded steel tubes
provide good fabrication and welding characteristics depending on the selected
grade.
• Suitable for conventional
welding processes
• Good tube bending characteristics
• Suitable for forming operations
• Good machining characteristics
• Reliable welded joint performance
• Suitable for heat exchanger fabrication
• Good dimensional stability
Proper welding and
fabrication procedures should be selected according to the specific steel grade
and tube thickness.
Heat Treatment
Heat treatment depends on the
selected material grade and required delivery condition.
• Normalizing improves
structural uniformity
• Annealing improves ductility and formability
• Solution annealing is applicable to austenitic stainless steel grades
• Controlled heat treatment provides consistent mechanical properties
• Stress relieving can reduce residual fabrication stresses
• Proper heat treatment improves long-term service performance
Advantages of DIN 28181 Welded Steel Tubes
• Excellent heat-transfer
capability
• Reliable welded construction
• Good mechanical strength
• High dimensional accuracy
• Good pressure resistance
• Excellent fabrication characteristics
• Available in carbon, alloy, and stainless steel grades
• Good corrosion resistance with stainless steel grades
• Long operational life
• Suitable for demanding heat exchanger applications
Conclusion
DIN 28181 Welded Steel Tubes
are designed for tubular heat exchangers, condensers, process equipment, and
industrial heat-transfer systems. The current grade range includes P235GH,
P215NL, 16Mo3, X5CrNi18-10, X5CrNiMo17-12-2, X6CrNiMoTi17-12-2, and
X6CrNiTi18-10. The current standard specifically removed the older St 37.0, St
37.8, and TTSt 35 N grades.
Ladhani Metal Corporation
supplies DIN 28181 Welded Steel Tubes in various grades, sizes, wall
thicknesses, lengths, surface finishes, and customized dimensions for heat
exchangers, condensers, chemical plants, petrochemical facilities, power
generation, and industrial process equipment worldwide.
FOR REQUIREMENT OF THIS GRADE
OR FOR DETAIL CONTACT US AT :-
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