ASTM A53 VS. A106 PIPES

DIFFERENCES A106 / A53 PIPES

What is the difference between A53 and 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

A last pipe specification that often overlaps with A53 / A106 is the API 5L Gr. B, which covers linepipes. These three specs are very close in terms of chemical composition, mechanical properties: some manufacturers actually mark the same lenght / budle of pipe with the three standards at the same time 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 enquiry for A53 pipes.

That said, the main differences among A106 and A53 pipes are in terms of:

  • manufacturing process: A106 pipes are available only in seamless execution, whereas A53 pipes are either welded or seamless
  • pressure range: A106 pipes withstand higher pressure and temperature ranges
  • chemical composition and mechanical properties (see tables below)

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

DIFFERENCES IN 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

 

DIFFERENCES IN MECHANICAL PROPERTIES

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

 

 

 

Looking for additional info? Contact the pipingonline expert team

Useful links: ANSI | ASME | ASTM | API | MSS | BS | DIN | ISO