Iron & Steel

Food AISI 304L Stainless Steel Welded Pipe EN 1.4307 Heat Exchanger Tubes 25.4 X 1.2MM

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Description:

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Electric welded circular cross-section tubes EN10217-7.

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Application: electric welded steel tubes to be used under pressure.

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Stainless steel types1.4301 and 1.4307 are also known as grades 304 and 304L respectively. Type 304 is the most versatile and widely used stainless steel. It is still sometimes referred to by its old name 18/8 which is derived from the nominal composition of type 304 being 18% chromium and 8% nickel.


Type 304 stainless steel is an austenitic grade that can be severely deep drawn. This property has resulted in 304 being the dominant grade used in applications like sinks and saucepans.


Type 304L is the low carbon version of 304. It is used in heavy gauge components for improved weldability. Some products such as plate and pipe may be available as “dual certified” material that meets the criteria for both 304 and 304L.

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Corrosion Resistance:

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304 has excellent corrosion resistance in a wide variety of environments and when in contact with different corrosive media. Pitting and crevice corrosion can occur in environments containing chlorides. Stress corrosion cracking can occur at temperatures over 60°C.

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Heat Resistance:

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304 has good resistance to oxidation in intermittent service up to 870°C and in continuous service to 925°C. However, continuous use at 425-860°C is not recommended if corrosion resistance in water is required. In this instance 304L is recommended due to its resistance to carbide precipitation.

Where high strength is required at temperatures above 500°C and up to 800°C, grade 304H is recommended. This material will retain aqueous corrosion resistance.

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Cold Working:

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304 stainless steel readily work hardens. Fabrication methods involving cold working may require an intermediate annealing stage to alleviate work hardening and avoid tearing or cracking. At the completion of fabrication a full annealing operation should be employed to reduce internal stresses and optimise corrosion resistance.

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Heat Treatment:

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304 stainless steel cannot be hardened by heat treatment.

Solution treatment or annealing can be done by rapid cooling after heating to 1010-1120°C.

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Specification:

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EN10217-7 Welded Stainless Steel Tube Chemical Requirements (wt%) |
Elements | 1.4301 | 1.4307 | 1.4404 |
C Max. | 0.07 | 0.030 | 0.03 |
Mn Max. | 2.00 | 2.00 | 2.00 |
P Max. | 0.045 | 0.045 | 0.045 |
S Max. | 0.015 | 0.015 | 0.015 |
Si Max. | 1.00 | 1.00 | 1.00 |
Cr | 17.00-19.50 | 17.00-19.50 | 16.50-18.50 |
Ni | 8.00-10.50 | 8.00-10.00 | 10.00-13.00 |
Mo | - | ? | 2.00-2.50 |
N | 0.10 Max. | ? | 0.10 Max |
Cu | - | ? | ? |
Other | ? | ? | ? |
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Welded Stainless Steel Tube EN10217-7 |
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Diameter
(inch) | Outside
Diameter
(mm) | Brimingham Wire Gauge |
18 | 16 | 14 | 12 | 11 |
WALL THICKNESS (MM) / WEIGHT (KG/M) |
1.24 | 1.65 | 2.11 | 2.77 | 3.05 |
5/8 | 15.88 | 0.455 | 0.588 | 0.728 | ? | ? |
3/4 | 19.05 | 0.553 | 0.719 | 0.895 | ? | ? |
1 | 25.40 | 0.750 | 0.981 | 2.231 | 1.570 | 1.707 |
11/4 | 31.75 | 0.949 | 1.246 | 1.569 | 2.014 | 2.196 |
11/2 | 38.1 | 1.144 | 1.506 | 1.902 | 2.451 | 2.677 |
13/4 | 44.45 | 1.342 | 1.768 | 2.237 | 2.891 | 3.162 |
2 | 50.80 | 1.539 | 2.031 | 2.573 | 3.331 | 3.647 |
21/2 | 63.50 | 1.834 | 2.423 | 3.074 | 3.990 | 4.371 |
3 | 76.20 | 2.327 | 3.080 | 3.915 | 5.093 | 5.587 |
31/2 | 88.90 | ? | 3.605 | 4.585 | 5.974 | 6.557 |
4 | 101.60 | ? | 4.130 | 5.256 | 6.855 | 7.526 |
41/2 | 114.30 | ? | 4.654 | 5.927 | 7.736 | 8.496 |
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Applications:

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Heat Exchanger / Food and Dairy Industry use etc.

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