Hi bob365-ga,
Thank you for your most interesting question! I had a fun time
researching this and learned a little more about steel industry
standards.
Using "tensile strength" as the key determinant in answering your
question, my search unearthed many websites that consistently
published the standard range for DIN 1630 / St 37.4. I then converted
this from metric to imperial values, and compared them to the tensile
strengths for different grades of ASTM A513 as found on one Web page.
Using the most commonly found ASTM A513 grades, it would appear that
your suspicion can be verified, that "the St 37.4 standard is as
strong or stronger than steel tubing manufactured to the ASTM A513
standard". However, the ASTM A513 grades do vary somewhat, so it
depends what grade you are comparing with. I've broken down my
analysis into three discrete steps :
A. ==== TENSILE STRENGTH OF DIN 1630 / St 37.4 ====
Judging from a large number of web pages, including the following
ones, it looks like the tensile strength specified by DIN 1630 / St
37.4 falls within the 350.0 - 480.0 N/mm² range :
+-------------------------------+
Sinarsky Pipe Works (Products)
DIN 1630 : SEAMLESS TORUS TUBES FROM NOT ALLOYED STEEL FOR EXTREMELY
HIGH REQUIREMENTS
http://www.sinarsky.ru/eng/prod7.html
----Table 30----
Material : St 37.4
Material NO : 1.0255
Tensile strength, R m , N/mm² : 350.0 - 480.0
Yield strength, min., R EN , N/mm² : 235.0
Elongation, min., A 5 , by cent : 25.0
+-------------------------------+
e-pipe Korea
DIN 1630-84 SEAMLESS CIRCULAR TUBES OF NON ALLOY STEELS WITH VERY HIGH
QUALITY REQUIREMENTS
http://www.e-pipe.co.kr/eng/DIN/1630.htm
----Table 3----
Steel grade (Symbol, Material Number) : St 37.4, 1.0255
Upper yield stress | ReH | for wall thicknesses, in mm, (N/§± min.) :
up to 16 : 235
over 16 up to 40 : 225
over 40 up to 65 : 215
Tensile strength Rm | N/§± : 350 3) to 480
Elongation after fracture A5 (% min) :
longitudinal : 25
transverse : 23
Impact energy 1 (ISO V-notch test pieces at+20¢ª (J min.) :
longitudinal : 43
transverse : 27
+-------------------------------+
Metric Seamless Tube
http://www.parker.com/tfd/bulletinpdf/MSTwall.pdf
Material : St 37.4 fine-grain quality per DIN 1630
Tensile Strength : 340 N/mm2 (49,000 lb/in2) minimum
+-------------------------------+
Metric Seamless Steel Tubing
http://www.flanges-au.com/products/002.htm
Material : ST37.4 according to DIN 1630 Material No 1.0255
finegrained quality
Tensile Strength Rm inN/mm2 : 350…480
+=================+
B. ==== CONVERTING BETWEEN N/mm² and psi (pound per square inch)
====
Convert-me.Com Weight and Mass conversion
http://www.convert-me.com/en/convert/weight
1 N = 0.102 Kg
Convert-me.Com Pressure conversion
http://www.convert-me.com/en/convert/pressure
1 psi = 0.07031 Kg/cm2
Therefore 1 psi = .07031/0.102 N/cm2 = 0.6893 N/cm2
Convert-me.Com Area conversion
http://www.convert-me.com/en/convert/area
1 cm2 = 100 mm2
Therefore 1 N/cm2 = 0.01 N/mm2
Therefore 0.6893 N/cm2 = 0.6893 X 0.01 N/mm2 = 0.006893 N/mm2
Therefore 1 psi = 0.006893 N/mm2
+-------------------------------+
THEREFORE Tensile strength of DIN 1630 / St 37.4,
... with a range of : 350.0 to 480.0 N/mm2
is equivalent to a range of : 50,776 to 69,636 psi
... with a median value of : (50,776 + 69,636) / 2 = 60,206 psi =
415 N/mm2
+=================+
C. ==== TENSILE STRENGTH OF ASTM A513 ====
Scouring the Web high and low, I was not able to find any sources that
published ASTM A513 specifications for free (paid sources pasted
below). However, I found an excellent Korean website (e-pipe) that
listed the minimum tensile strengths of all the grades available for
ASTM A513. Since I don't know what grade of ASTM A513 you are looking
to compare, here is the link for your reference :
+-------------------------------+
ASTM A513-88-ASME SA513 ELECTRIC RESISTANCE WELDED CARBON AND ALLOY
STEEL MECHANICAL TUBING
http://www.e-pipe.co.kr/eng/ASTM/A513.htm
This page publishes the minimum tensile strengths of all the grades
available for ASTM A513. Using 1010 and 1020 as the most common grades
(these appear most frequently in search results), we get a range of :
ASTM A513 Tensile Strength = 310 to 359 N/mm2
... with a median value of (310 + 359) / 2 = 334.5 N/mm2
+=================+
D. ==== CONCLUSION ====
In conclusion, assuming the most common grades of ASTM A513, it would
appear that DIN 1630 / St 37.4 has an average higher Tensile Strength.
Using our assumptions, we are comparing the following median values :
ASTM A513 :
334.5 N/mm2
DIN 1630 / St 37.4
415 N/mm2
HOWEVER, specific comparison depends on what grade ASTM A513 you are
looking at.
+=================+
==== OTHER INFO ====
A513-00 Standard Specification for Electric-Resistance-Welded Carbon
and Alloy Steel Mechanical Tubing
(online purchase & download, $35)
http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/PAGES/A513.htm?E+mystore
+-------------------------------+
SN Comparative Steel Standards Feature :
ASTM International Forges New Guide for Comparing Steel Standards :
Handbook and CD-ROM Simplify Searches for Material Equivalency
http://www.astm.org/SNEWS/JANUARY_2002/ds67a_jan02.html
"This month, ASTM International publishes The Handbook of Comparative
World Steel Standards: Second Edition (DS67A). Completely updated and
revised, the Handbook groups comparable steels based on their chemical
composition and mechanical properties according to a detailed set of
rules outlined in the first chapter."
"Foreign steel is often cheaper, more available, or might be
stipulated in contracts. Babcock and Wilcox uses local foreign
materials for much of the auxiliary equipment (structural steel,
sheet, and other non-pressure containing components) when they build a
boiler oversees."
" "A lot of these countries have excellent materials for the less
critical parts," Tanzosh says. "Where we're allowed to use foreign
materials, we will use them because of their economy and availability.
That's where we need to have references like your Handbook that
describe the material specifications of the different countries that
are available in different areas of the world for us to be able to
procure and use in construction of the boilers. "
+-------------------------------+
ISteelAsia Unit Converter
http://www.isteelasia.com/tools/tool538.jsp
+=================+
Google Search Terms :
"St 37.4" OR "DIN 1630" tensile
://www.google.com/search?q=%22St+37.4%22+OR+%22DIN+1630%22+tensile&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off
ASTM A513 OR "A 513" tensile
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=ASTM+A513+OR+%22A+513%22+tensile&btnG=Google+Search
I hope this answers your question, and provides further resources for
your reading. Please do not hesitate to request clarification if
needed. Thank you for using Google Answers.
Warmest regards,
kyrie26-ga |
Clarification of Answer by
kyrie26-ga
on
29 Aug 2002 12:02 PDT
Hello again bob365-ga,
My research seems to indicate that "St 37.4" is not really a standard,
but a grade of steel. Looking at the web pages I have found (some of
which were listed earlier), a DIN standard is usually accompanied by
several St grades. This Web page seems to confirm it too :
+--------------------------+
Seamless tubes for pipelines, structural purposes and shipbuilding
industry
http://www.hutabatory.com.pl/hb_s211_en.htm
"A. Specifications:
Tubes are manufactured in accordance with requirements of Polish or
foreign standards: DIN 1629, 1630, 17121, 17175, 10210-1,
DIN-EN10210-1, NFA 49-112, ASTM A53, A106, GOST 8731-87, BV, DNV, LRS,
GL, TÜV API5L, PRS Rules. We are also accepted for applying of ÜHP
conformity mark for line and constructional tubes intended for
structures."
"B. Steel grades:
St37.0, St44.0, St52.0, St37.4, St44.4, St52.4, RSt37-2, St37-3,
St44-2, St44-3, St45-8, St52-3, St35.8, TUE220A, TUE235A, A, B, C,
NVA, NVR1-1, NVR1-2, 320, 360, 410, 19Mn5, 15Mo3, 13CrMo910, 14MoV63,
S355JOH, S355J2H, P91."
+--------------------------+
This is also supported by the fact that a search through the paid
standards specification providers does not reveal any "St" as a
standard.
+--------------------------+
Here is another link that supports this :
Abek - Your partner in the waster and energy sectors
http://www.abek.de/abek2/water2.htm
+--------------------------+
...so St 37.4 is actually a "materials specification" or composition
specification.
+--------------------------+
Please refer to Table 29 on the following link for the specifics of
this composition :
Sinarsky Pipe Works (Products)
http://www.sinarsky.ru/eng/prod7.html
+--------------------------+
Again I would like to refer to our Korean e-pipe page for the same
table (scroll to the bottom on the page provided by the following
link) :
DIN1630-84 SEAMLESS CIRCULAR TUBES OF NON ALLOY STEELS WITH VERY HIGH
QUALITY REQUIREMENTS
http://www.e-pipe.co.kr/DIN/1630.htm
+--------------------------+
Google Search Terms :
ST37.4 OR "ST 37.4" specification OR specifications
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=ST37.4+OR+%22ST+37.4%22+specification+OR+specifications&btnG=Google+Search
ST37.4 OR "ST 37.4" composition
://www.google.com/search?q=ST37.4+OR+%22ST+37.4%22+composition&hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off
Hope we are getting closer! Let me know otherwise.
Have a great day,
kyrie26-ga
|
