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Introduction
ASTM A268 /
A268M covers seamless and welded ferritic and martensitic stainless steel
tubing intended for general corrosion-resistant and high-temperature service. These
tubes are known for their good mechanical strength, oxidation resistance, and
cost-effectiveness compared to austenitic stainless steels.
ASTM A268
stainless steel tubing is widely used in industries requiring moderate
corrosion resistance and durability under varying temperature conditions.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A268 /
A268M stainless steel tubes, supplying high-quality seamless and welded tubing
for general service applications.
Applicable Standard
Standard
Specification: ASTM A268 / A268M
Organization: ASTM International
Title: Standard Specification for Seamless and Welded Ferritic and Martensitic
Stainless Steel Tubing for General Service
This
specification covers stainless steel tubing for general-purpose applications
requiring corrosion resistance and mechanical strength.
Forms of Supply
ASTM A268
stainless steel tubes are supplied in the following forms:
Seamless
tubes
Welded tubes
Cold drawn tubes
Cut-to-length tubes
Supply
Condition
Annealed
condition
Heat-treated condition
Tempered condition (for martensitic grades)
Surface
Finish
Mill finish
Annealed and pickled
Polished (if required)
Standard
Sizes
Outside
Diameter: 6 mm to 127 mm
Wall Thickness: 0.5 mm to 10 mm
Length: Up to 12 meters or as required
Grades Covered Under ASTM A268 / A268M
Ferritic
Stainless Steel Grades:
TP405
TP409
TP430
Martensitic
Stainless Steel Grades:
TP410
TP420
These grades
offer a combination of corrosion resistance, strength, and heat resistance
depending on composition and heat treatment.
Chemical Composition of ASTM A268 Stainless Steel
Tubes (%)
|
Grade |
C Max |
Mn Max |
P Max |
S Max |
Si Max |
Ni |
Cr |
Mo |
Al |
Cu |
N |
Ti / Stabilizers |
|
TP405 |
0.08 |
1.00 |
0.04 |
0.03 |
1.00 |
0.50
max |
11.5–14.5 |
— |
0.10–0.30 |
— |
— |
— |
|
TP410 |
0.15 |
1.00 |
0.04 |
0.03 |
1.00 |
— |
11.5–13.5 |
— |
— |
— |
— |
— |
|
TP429 |
0.12 |
1.00 |
0.04 |
0.03 |
1.00 |
— |
14.0–16.0 |
— |
— |
— |
— |
— |
|
TP430 |
0.12 |
1.00 |
0.04 |
0.03 |
1.00 |
— |
16.0–18.0 |
— |
— |
— |
— |
— |
|
TP443 |
0.20 |
1.00 |
0.04 |
0.03 |
1.00 |
0.75
max |
18.0–23.0 |
— |
— |
— |
0.90–1.25 |
— |
|
TP446-1 |
0.20 |
1.50 |
0.04 |
0.03 |
1.00 |
0.75 max |
23.0–27.0 |
— |
— |
— |
— |
0.25 |
|
TP446-2 |
0.12 |
1.50 |
0.04 |
0.03 |
1.00 |
0.50
max |
23.0–27.0 |
— |
— |
— |
— |
0.25 |
|
— |
0.08 |
1.00 |
0.045 |
0.045 |
1.00 |
0.80
max |
11.5–13.0 |
— |
— |
— |
— |
12×C
min; 1.10 max |
|
TP409 |
0.08 |
1.00 |
0.045 |
0.03 |
1.00 |
0.50
max |
10.5–11.7 |
— |
— |
— |
— |
6×C
min; 0.75 max |
|
TP439 |
0.07 |
1.00 |
0.04 |
0.03 |
1.00 |
0.50
max |
17.0–19.0 |
— |
0.15 |
— |
0.04 |
0.20+4(C+N)
min; 1.10 max |
|
— |
0.03 |
1.00 |
0.04 |
0.03 |
1.00 |
0.50 |
17.0–19.0 |
— |
0.15 |
— |
— |
0.20+4(C+N)
min; 0.75 max |
|
— |
0.05 |
0.5–1.0 |
0.03 |
0.03 |
0.6 |
3.5–5.5 |
11.5–14.0 |
0.5–1.0 |
— |
— |
— |
— |
|
TP430Ti |
0.10 |
1.00 |
0.04 |
0.03 |
1.00 |
0.75
max |
16.0–19.5 |
— |
— |
— |
— |
5×C
min; 0.75 max |
|
TP
XM27 |
0.01 |
0.40 |
0.02 |
0.02 |
0.40 |
0.50
max |
25.0–27.5 |
0.75–1.50 |
— |
0.20 |
0.015 |
0.05–0.20 |
|
TP
XM33 |
0.06 |
0.75 |
0.04 |
0.02 |
0.75 |
0.50
max |
25.0–27.0 |
0.75–1.50 |
— |
0.20 |
0.04 |
7×(C+N)
min; 1.00 max |
|
18Cr-2Mo |
0.025 |
1.00 |
0.04 |
0.03 |
1.00 |
1.00
max |
17.5–19.5 |
1.75–2.50 |
— |
— |
0.035 |
0.20+4(C+N)
min; 0.80 max |
|
29-4 |
0.01 |
0.30 |
0.025 |
0.02 |
0.20 |
0.15
max |
28.0–30.0 |
3.5–4.2 |
— |
0.15 |
0.020 |
— |
|
29-4-2 |
0.01 |
0.30 |
0.025 |
0.02 |
0.20 |
2.0–2.5 |
28.0–30.0 |
3.5–4.2 |
— |
0.15 |
0.020 |
— |
|
26-3-3 |
0.03 |
1.00 |
0.04 |
0.03 |
1.00 |
1.0–3.5 |
25.0–28.0 |
3.0–4.0 |
— |
— |
0.04 |
6×(C+N)
min |
|
25-4-4 |
0.025 |
1.00 |
0.04 |
0.03 |
0.75 |
3.5–4.5 |
24.5–26.0 |
3.5–4.5 |
— |
— |
0.035 |
0.20+4(C+N)
min; 0.80 max |
|
— |
0.03 |
1.00 |
0.04 |
0.03 |
1.00 |
1.00
max |
28.0–30.0 |
3.6–4.2 |
— |
— |
0.045 |
6×(C+N)
min |
|
— |
0.015 |
0.50 |
0.02 |
0.005 |
0.50 |
3.0–4.0 |
28.0–29.0 |
1.8–2.5 |
— |
— |
0.02 |
0.15–0.50 |
|
— |
0.03 |
1.50 |
0.04 |
0.015 |
1.00 |
0.30–1.00 |
10.5–12.5 |
— |
— |
— |
0.03 |
— |
|
— |
0.03 |
1.00 |
0.04 |
0.015 |
1.00 |
— |
17.5–18.5 |
— |
— |
— |
— |
(3×C +
0.30) min |
|
— |
0.08 |
1.00 |
0.045 |
0.03 |
1.00 |
1.0–2.5 |
13.5–15.5 |
0.2–1.2 |
— |
— |
— |
0.30–0.50 |
|
TP468 |
0.03 |
1.00 |
0.04 |
0.03 |
1.00 |
0.50 |
18.0–20.0 |
— |
— |
— |
0.03 |
0.20+4(C+N)
min; 0.80 max |
Mechanical Properties – ASTM A268 (Ferritic Stainless Steel Tubes)
|
Grade |
Tensile Strength (min) ksi [MPa] |
Yield Strength (min) ksi [MPa] |
Elongation (min) % |
|
TP405 |
60 [415] |
30 [205] |
20 |
|
—
(S40800) |
55 [380] |
30 [205] |
20 |
|
TP410 |
60 [415] |
30 [205] |
20 |
|
TP429 /
TP430 / TP430Ti |
60 [415] |
35 [240] |
20 |
|
TP443 |
70 [485] |
40 [275] |
20 |
|
TP446-1 |
70 [485] |
40 [275] |
18 |
|
TP446-2 |
65 [450] |
40 [275] |
20 |
|
TP409 |
55 [380] |
25 [170] |
20 |
|
TP439 |
60 [415] |
30 [205] |
20 |
|
— (S43932) |
60 [415] |
30 [205] |
20 |
|
—
(S41500) |
115
[795] |
90 [620] |
15 |
|
TPXM-27 |
65 [450] |
40 [275] |
20 |
|
TPXM-33 |
68 [470] |
45 [310] |
20 |
|
18Cr-2Mo |
60 [415] |
40 [275] |
20 |
|
29-4 /
29-4-2 |
80 [550] |
60 [415] |
20 |
|
26-3-3 |
85 [585] |
65 [450] |
20 |
|
25-4-4 |
90 [620] |
75 [515] |
20 |
|
— (S44735) |
75 [515] |
60 [415] |
18 |
|
28-2-3.5 |
87 [600] |
72 [500] |
16 |
|
—
(S40977) |
65 [450] |
41 [280] |
18 |
|
—
(S43940) |
62 [430] |
36 [250] |
18 |
|
—
(S42035) |
80 [550] |
55 [380] |
16 |
|
TP468 |
60 [415] |
30 [205] |
22 |
Key Features of ASTM A268 Stainless Steel Tubes
Good
corrosion resistance in mild environments
High strength and hardness (especially martensitic grades)
Excellent oxidation resistance at elevated temperatures
Cost-effective compared to austenitic stainless steels
Good machinability and moderate weldability
Suitable for general service applications
Applications of ASTM A268 Stainless Steel Tubes
ASTM A268 tubes are widely used in industries requiring corrosion resistance
and mechanical durability.
Automotive
Industry
• Exhaust systems
• Structural tubing
Power Plants
• Boiler components
• Heat transfer tubing
Oil &
Gas Industry
• General service piping
• Structural applications
Industrial
Equipment
• Heat exchangers
• Mechanical tubing
Heat Treatment
Ferritic
grades are typically annealed
Martensitic grades are hardened and tempered
Heat treatment improves strength, hardness, and corrosion resistance
Ensures uniform microstructure and performance
Conclusion
ASTM A268 /
A268M stainless steel tubes provide a reliable and cost-effective solution for
general service applications. With a range of ferritic and martensitic grades,
these tubes offer a balance of strength, corrosion resistance, and heat
resistance.
Ladhani
Metal Corporation supplies ASTM A268 / A268M stainless steel tubes in various
grades and sizes, ensuring high-quality products for automotive, industrial,
and power generation applications.
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