It is carbon steel, W.Nr. 1.0037, DIN St 37-2 with the following composition (the same as RSt 37-2): C ≤ 0.17%, P ≤ 0.050%, S ≤ 0.050%, N ≤ 0.009%. It doesn't relate to any ASTM, but there are two other similar which do: W.Nr. 1.0036, DIN USt 37-2 (Germany) = AFNOR E 24-2 (France) = B.S. 4360 B (Great Britain) = UNI Fe 360 B Fu (Italy) = JIS SS34 (Japan) = SS 1312; 1311 (Sweden) = GOST 16 D; 18 kp (Russia) = UNE A 360 B; F.6202-AE 235-B (Spain) = AISI/SAE/ASTM A 570 Gr.

Please tell me the material composition of 10B21 boron steel, with the tolerance and permissible limits in %age.

Class Symbols (Applicable till the end of 1990): These tubes are classified into 3 grades and their class symbols are given as: We need to know how we can get Hydrant, Pipes & Sprinkler? The Manufacturer, their address, telephone. Thanks.

St 37-2, DIN Standard 12120, W.Nr. 1.0037: C ≤ 0,17%, P ≤ 0,050%, S ≤ 0,050%, Others: N ≤ 0,009%

All such and similar decisions may be only made by responsible expert engineer of the respective plant!

St 52 = W.Nr. 1.0580, Component = % max., C = 0.20, Si = 0.55, Mn = 1.50, P = 0.050, S = 0.050, N = 0.007 St 52.3 = W.Nr. 1.0570, Component = % max., C = 0.22, Si = 0.55, Mn = 1.60, P = 0.040, S = 0.040, Al = (0.020)

DIN St 52-3 = W.Nr. 1.0570; AFNOR - France = E 36-3; E 36-4; B.S. - Great Britain = 4360-50 B; 50 C; 50 D; UNI - Italy = Fe 510 B; C; D; JIS - Japan = SM 50 YB; SM 53 B; C; SS - Sweden = 2132; GOST - Russia = 17 GS, 17 G 1 S; UNE - Spain = A 510 C; D; F.6214 AE 355-C; AISI/SAE/ASTM - U.S.A. = -.

See it at http://www.steeltubestrade.net/tech_standards.php and previous question asked by walterkowalski@Univsteel.com

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Although their "official" names are listed on top, we generally refer to them as 18mm, 11mm, 10mm, 8mm or 9.4mm, which is the actual spacing between pin #1 and pin #2.