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.

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

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. = -.

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)

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

AFNOR - E 36-3; E-36-4, B.S. - 4360-50 B; 50 C; 50 D, UNI - Fe 510 B; C; D, JIS - SM 50 YB; SM 53 B; C, SS - 2132, GOST - 17 GS; 17 G 1 S, UNE - A 510 C; D; F. 6214 AE 355-C, AISI/SAE/ASTM - A 572 Gr. 50; 1024; 1524; K 12709.

All seamless precision steel tubes used as pressure lines for hydraulic and pneumatic purposes. Search over www.google.com equivalents for DIN 2445/2, EN 10204.

an Exclusive member you can find 6 different suppliers for the required tubes, from those who have joined the products to their account, under following products:

Ternex is manufactured to British Standard BS 6582 :1985. The steel substrate is to EN 10130 : 1999 in the following grades: DC01, DC03, DC04, DC05, DC06. Continuously hot-dip lead alloy coated cold rolled carbon and austenitic stainless steel flat rolled products.

Otherwise search them over www.google.com by using the similar strings like: ASTM Standards, BS Standards, DIN Standards, JIS Standards etc.

GB 8162-82 YB(T)63-87: C = 0.42-0.50%, Si = 0.17-0.37%, Mn = 0.50-0.80%, P = 0.035%, S = 0.035%, Ni = 0.25%, Cr=0.25%, Cu0.25% (source: www.saleroad.com/know/steel/1011.htm) St 35-3: C max. = 0,16%, Mn = 0,35 - 0,65%, P max. = 0,040%, S max. = 0,040%, Cr max. = 0,30%, Ni max. = 0,30%, Al max. = 0,02%, Cu max. = 0,30%, Cr + Cu + Ni max. = 0,70% RSt 37-2, W.Nr. 1.0038 is equivalent to AISI/SAE/ASTM A 570 Gr. 36.

ASTM/ASME A/SA-178 = Grades A and C. Electric Resistance Welded Carbon Steel Boiler Tubes = DIN 17177, Steel 37.8 I - III, Steel 42.8 I - III ASTM/ASME A/SA-179 = Seamless Cold-Drawn low-Carbon Steel Heat Exchanger and Condenser Tubes = DIN 17175, Steel St 35.8, St 45.

Yes. In addition they can biodegrade in soil and backyard compost, fresh and marine water as well as in anaerobic environments such as septic systems.

BS 1387 is EN BS 1387 and for ASTM A53 - see previous answers to: hfayez@nets.com.jo, quasiy@yahoo.com & terence.sundgren@eskom.co.za

For Casing and/or Tubing pipes sometimes grade is not indicated at all and indicated only a letter as "K", "D" etc. acc. to related yield and tensile strengths.

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

There is no tubes standard that regulates delivery conditions which requires thermal conductivity factor for any pipe. If you need these tubes for some special applications, where it is required, you will have to find either a tube manufacturer or some specialized laboratory that will be able to test them appropriately for you.

DIN (or Deutsche Industrial Normale) is a series of uniformity standards developed in Germany, which apply to commonly manufactured items.

Something about this topic you can find and ask at: http://www.putzmeister.de/gb/news/presse/1077-1/default.asp