ASTM A106 VS. ASTM A53 AND API 5L PIPES


In this article, we explain the main differences between ASTM A106, ASTM A53 and, API 5L pipes, in terms of chemical composition, fit for use and mechanical/physical properties.


 

ATSM A53 VS ASTM A106: GENERAL DIFFERENCES

Difference ASTM A53 and A106 pipes

What is the difference between ASTM A53 and ASTM A106 pipes? To answer this question, we need first to recap what these standards are all about:

  • ASTM A106: covers seamless carbon steel pipes for high-pressure applications (and for temperatures up to 750 degrees F)
  • ASTM A53: covers black and hot dip galvanized carbon steel pipes for low/medium pressure and mechanical application

These two ASTM specifications for pipes are very close in terms of chemical composition and mechanical properties: indeed, some manufacturers mark their pipes with both standards (and sometimes also with the API 5L Gr. B) to indicate their interchangeability. For the same reason, it is also quite common that suppliers quote alternatively API 5L or A106 pipes if they receive an inquiry for A53 pipes.

That said, there are a few differences between A106 and A53 pipes:

  • Manufacturing process: ASTM A106 pipes are available only in seamless execution, whereas A53 pipes are either welded or seamless
  • Pressure range: ASTM A106 pipes withstand higher pressure and temperature ranges
  • Chemical composition and mechanical properties (see explanations below)

As a rule of thumb, A106 pipes are supplied when seamless execution is requested, A53 when welded execution is preferred for cost reasons.

 

Multiple markings on pipes ASTM API

The image shows pipes compliant to multiple standards, ASTM A106, ASTM A53 and API 5L Gr. B


 

ASTM A106 VS ASTM A53 PIPES: CHEMICAL COMPOSITION

The chart shows the difference between A106 and A53 pipes in terms of chemical composition:

Standard Grade Chemical Composition %
C Mn P S Si Cr Cu Ni Mo V
ASTM A106 B ≤0.30 0.29-1.06 ≤0.035 ≤0.035 >0.10 ≤0.40 ≤0.40 ≤0.40 ≤0.15 ≤0.08
ASTM A53 B ≤0.30 ≤1.20 ≤0.05 ≤0.045 ≤0.40 ≤0.40 ≤0.40 ≤0.15 ≤0.08
API 5L B(PSL-1) ≤0.28 ≤1.20 ≤0.030 ≤0.030
DIN 1629
DIN 2448
St 37.0 ≤0.17 ≤0.040 ≤0.040
St 44.0 ≤0.21 ≤0.040 ≤0.040
EN10210 S235JRH ≤0.17 ≤1.40 ≤0.040 ≤0.040
GB/T8163
GB/T8162
10# 0.07-0.13 0.35-0.65 ≤0.035 ≤0.035 0.07-0.37 ≤0.15 ≤0.25 ≤0.30
20# 0.17-0.23 0.35-0.65 ≤0.035 ≤0.035 0.17-0.37 ≤0.25 ≤0.25 ≤0.30

 


 

ASTM A106 VS ASTM A53 PIPES: MECHANICAL PROPERTIES

The chart shows the difference between A106 and A53 pipes in terms of mechanical properties (tensile/yield strength, elongation and impact test requirements):

Standard Grade Tensile Strength
(MPa)
Yield Strength
(MPa)
Trans.Elongation
(%)
Impact Test
(J)
ASTM A106 B >415 ≥240 ≥16.5
ASTM A53 B >415 ≥240
API 5L B(PSL-1) >414 ≥241 As clause a
DIN 1629 St 37.0 350-480 ≥235 ≥23
DIN 2448 St 44.0 420-550 ≥275 ≥19
EN10210 S235JRH 360-510 ≥235 ≥26 27 (+20°C)
GB/T 8163 10# 335-475 ≥205 ≥24
GB/T 8162 20# 410-550 ≥245 ≥20

 


ASTM A53 VS API 5L PIPES: MECHANICAL PROPERTIES

Pipe material Yield Strength minimum psi Tensile Strength minimum psi
ASTM A53 Gr. A
ASTM A106 Gr. A
API 5L Gr. B
30,000.00 48,000.00
ASTM A252 Gr.1 30,000.00 50,000.00
ASTM A53 Gr. A
ASTM A106 Gr. A
API 5L Gr. A
35,000.00 60,000.00
ASTM A252 Gr. 2 35,000.00 60,000.00
ASTM A501 36,000.00 58,000.00
ASTM A106 Gr. C 40,000.00 70,000.00
ASTM A252 Gr. 3 45,000.00 66,000.00
API 5L X42 42,000.00 60,000.00
API 5l Gr X46 46,000.00 63,000.00
API 5l Gr X52 52,000.00 66,000.00
API 5l Gr X56 56,000.00 71,000.00
API 5l Gr X60 60,000.00 75,000.00
API 5l Gr X65 65,000.00 77,000.00
API 5l Gr X70 70,000.00 82,000.00