DIN 2440 Steel Tubes Medium Weight Suitable for Screwing

Product Overview

Description

DIN 2440 Steel Tubes Medium Weight Suitable for Screwing

1. Scope
This Standard applies to medium-weight tubes suitable for screwing. They are suitable for nominal pressure 2 for liquids and nominal pressure 10 for air and non-hazardous gases.

2. Other relevant Standards
DIN 2444 Zinc coatings on steel tubes; quality standard for the hot galvanizing of steel tubes for installation purposes
DIN 2999 Part 1 Whitworth pipe threads for tubes and fittings; cylindrical internal thread and conical external
DIN 17100 Steels for general structural purposes; quality specifications
DIN 50136 Testing of metallic materials; flattening test on tubes

3. Dimension and designation
3.1 Dimension Table 1.

3.2 Permissible dimensional deviations Table 3.

Nominal size DN	d1 max.	d1 min.
6	10.6	9.8
8	14.0	13.2
10	17.5	16.7
15	21.8	21.0
20	27.3	26.5
25	34.3	33.3
32	42.9	42.0
40	48.8	47.9
50	60.8	59.7
65	76.6	75.3
80	89.5	88.0
100	115.0	113.1
125	140.8	138.5
150	166.5	163.9

Wall thickness
- 12.5% (-15% at individual points not longer than 2 X the outside diameter, provided that this reduction is effective only on the outer surface).
The upper limit is fixed by the permissible weight deviation.

3.3 Deviation in mass
Compared with the weights specified in the table on page 1 deviations according to the following table are permissible Table 4.

For a single tube	For a consignment of not less than 10t
± 10%	± 7.5%

3.4 Straightness
The tubes must appear straight to the eye.

4. Pipe thread
Whiworth pipe thread conforming to DIN 2999 Par 1, taper 1:16

5. Material
St 33-2 conforming to DIN 17100, material number 1.0035.
In general, tubes conforming to this standard shall be suitable for fusion welding.
Neither the crystalline condition nor any variation in hardness occurring over the circumference and brought about by the manufactureing process may impair the proper threading of the tubes.

6. Design
Seamless or welded.

7. Finish Table 2.  

Surface	Symbol
Black	-
Black, suitable for galvanizing in accordance with sub-clause 10.3	A
Galvanized as specified in DIN 2444	B
Non-metallic protective coating outside	C
Non-metallic protective coating inside	D
Subject to agreement