An A53 pipe (grade A and B) is used to convey fluids at low/medium pressures and for mechanical applications. An A53 pipe can be welded, flanged and shaped as necessary, are available in three main types (“F”, i.e. continuous welding/longitudinal furnace butt welded not suited for flanging, “S” seamless hot rolled and cold finished, and “E” ERW).
ASTM A53/ASME SA 53 carbon steel pipes are available in the size range 1/4 to 30 inches and schedules 10 to 160, both in seamless and welded execution, black and hot-dip galvanized (HDG). The ASME B36.10 specification covers the dimensions and the tolerances of ASTM A53 steel pipes.
CHEMICAL COMPOSITION ASTM A53 PIPE
There are two grades of ASTM A53 pipes, defined “grade A” and “grade B”:
|Element||ASTM A53 Pipe Grade A||ASTM A53 Pipe Grade B|
|Carbon %||0.25 max||0.30 max|
|Manganese %||0.95 max||1.20 max|
|Phosphorous %||0.05 max||0.05 max|
|Sulphur %||0.045 max||0.045 max|
|Copper %||0.50 max||0.50 max|
|Nickel %||0.40 max||0.40 max|
|Chromium %||0.40 max||0.40 max|
|Molybdenum %||0.15 max||0.15 max|
|Vanadium %||0.08 max||0.08 max|
MECHANICAL PROPERTIES ASTM A53 PIPE
YIELD, TENSILE STRENGTH AND, ELONGATION ASTM A53 PIPE
|ASTM A53- ASME SA53 MATERIAL GRADE||Product Thickness
|Yield/ proof strength
ReH N/mm² min.
|Tensile strength Rm
|Elongation min.||Minimum average impact energy KV J
At a temperature in °C of
|Grade A*||–||205||min. 330||–||–||–||–||–|
|T ≤ 16||235||
360 – 500
|16 < T ≤ 40||225|
|40 < T ≤ 60||215|
|ASTM A53 Grade B*||–||240||min. 415||–||–||–||–||–|
|T ≤ 16||265||
410 – 570
|16 < T ≤ 40||255|
|40 < T ≤ 60||245|
* Delivery condition N=normalizing incl. normalizing forming
PHYSICAL PROPERTIES ASTM A53 PIPE
|Density at 20 °C
|Modulus of elasticity kN/mm² at||Thermal conductivity at 20 C°
|spec. thermal capacity at 20 C°
|spec. electrical resistivity at 20 °C
|20 C°||300 C°||400 C°||450 C°|
HOT FORMING AND HEAT TREATMENT ASTM A53 PIPE
|Hot forming||Heat treatment|
|Temperature °C||Type of cooling||Normalizing 1)||Stress relieving anneal 2)||Type of cooling|
|1100 – 950||Air||890 – 950 °C||600 – 650 °C||Air|
1) Normalizing: Holding time 1 minute per mm plate thickness, minimum 30 minutes
2) Stress relieving anneal: Holding time 1-2 minutes per mm plate thickness, minimum 30 minutes
TOLERANCES ASTM A53 PIPE
The tolerances for ASTM A53 – ASME SA53 pipes are set in the table below:
- wall thickness: the wt of the pipe shall be, at any point, not less than the nominal pipe size minus 12.5% (a wt of NPS -13% would not be, for instance, acceptable)
- weight per foot: + / – 10%
TESTING REQUIREMENTS ASTM A53 PIPE
Below are the required physical strength requirements under ASTM A53 Type E for grades A and B.
|Test||ASTM A53 – ASME SA53 Grade A||ASTM A53 – ASME SA53 Grade B|
|Yield||30,000 psi||35,000 psi|
|Tensile||48,000 psi||60,000 psi|
|Elongation||Determined by formula||Determined by formula|
In addition to the chemical and physical analysis, the following tests are required under ASTM A53:
|Test||Test ASTM A53 – ASME SA53|
|Flattening||Bend Test (Less than or equal to 2.375″ OD) *|
|Hydrostatic||Transverse Weld Tension (Equal to or greater than 8.625″ OD)|
ASTM A53 PIPE ENDS
- Pipe schedule below 0.500 inches and schedule STD / XS pipes: plain or beveled ends
- Pipe schedule above 0.500 inches and schedule XXS: Squared cut plain ends
If pipes are supplied with threaded ends, protection for threads is mandatory for pipes above 4 inches.
MARKING REQUIREMENTS ASTM A53 – ASME SA53 PIPE
Each length of pipe (or bundle for smaller diameters) shall have the following markings applied:
- Manufacturer name
- A53 type (S, E, F)
- Diameter and schedule (from 10 to 160 and XXS)
- Designation “ASTM A53”
- Pipe length
- Heat number
It is frequent to find pipes compliant with multiple standards at the same time: A53/A106/API 5L Gr. B (in this case the marks reports any covered standards).
GALVANIZED PIPE ASTM A53
Galvanized pipes are steel pipes that have been hot-dipped in a protective zinc coating to prevent corrosion and rust (the process is called “hot dip galvanization”). Galvanized pipes were introduced in the sixties as an alternative to lead pipes for water transmission and distribution. After that, they have been used also for sewerage applications, firefighting, and general plumbing systems.
During the galvanization process, the zinc coating applies both to the outside and the inside of the pipe. The standard zinc coating is between 1.6 and 1.8 oz per square foot.
Galvanized pipes show long-lasting durability, improved resistance to corrosion compared to standard black steel, and are available at a relatively cheap price (and good toughness) compared to alternative metals.
On the other side, galvanized pipes are heavy, difficult to repair and tend to develop blockages over the course of time (the internal part of the pipe is subject to corrosion, and it’s not infrequent to find completely rusted galvanized pipes few years after their installation).
GALVANIZED PIPES. ASTM A123, ASTM A153 and ASTM A53
First and foremost, there is a difference between ASTM A53 and ASTM A153. Companies specialized in pipes galvanization are familiar with the ASTM A153 specification (“Standard Specification for Zinc Coating Hot-Dip)on Iron and Steel Hardware”.
The section 17 of the more general ASTM A53 specification, sets requirements for galvanized pipe, i.e. it requires the pipe to be hot-dip galvanized with a zinc grade in accordance with the B6 specification (Standard Specification for Zinc ) and specify the minimum weight per unit area of the coating.
The ASTM A53 specification does not set requirements related to the finishing, the appearance, or the adherence of the galvanized coating that is instead well defined in the ASTM A123 specification (Standard Specification for Zinc, Hot-Dip Galvanized, Coatings on Iron and Steel Product). Further, the weight per unit area of the coating defined in the ASTM A53 specification corresponds to the minimum coating thickness requirements of ASTM A123. Therefore, the ASTM A123 specification is a more stringent than ASTM A53 with reference to the galvanized coating and whenever a pipe is galvanized according to ASTM A123, it meets the requirements of section 17 of ASTM A53 as well.
Conclusion: when a buyer requires galvanized pipes according to A53, a galvanization process in line with ASTM A123 meets the looser galvanization requirements set by ASTM A53.
A53 PIPE MANUFACTURERS
ERW PIPE MILLS (1 8″ – 72″)
|ERW Pipe Mill||Country|
|American Steel Pipe||USA|
|JV Nippon Sumitomo||Japan|
|Seah Steel||South Korea|
|Tata||India / UK|
DSAW PIPE MILLS (24″ – 72″)
|DSAW Pipe Mill||Country|
|JV Nippon Sumitomo||Japan|
|Seah Steel||South Korea|
|Tata Steel (ex-Corus)||India / UK|
ASTM A53 PIPE PRICES
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