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Piping Standards Reference

Q: What is NACE MR0175 / ISO 15156?

NACE MR0175 / ISO 15156 is the standard governing metallic materials for use in H2S-containing (sour) oil and gas environments. It sets requirements to resist sulphide stress cracking (SSC), hydrogen-induced cracking (HIC) and stress-oriented HIC — including hardness limits (typically ≤22 HRC for carbon steel), approved grades and required testing (NACE TM0177, TM0284).

Q: What is the difference between ASTM A106 and A53 pipe?

ASTM A106 is seamless carbon steel pipe rated for high-temperature service; ASTM A53 covers seamless and ERW pipe for general and lower-temperature service. A106 Gr B and A53 Gr B have similar chemistry, but A106 is specified where temperature rating and pressure integrity matter.

Q: What is the EN equivalent of ASTM A312 TP316L?

The EN/DIN equivalent of ASTM A312 TP316L is grade 1.4404 (X2CrNiMo17-12-2), supplied to EN 10216-5 (seamless) or EN 10217-7 (welded). TP304L corresponds to 1.4307 and TP321 to 1.4541.

The standards that govern the pipes, fittings, flanges and valves we supply — what each one covers, its grades and equivalents. A quick reference for engineers and buyers specifying material across GCC and African projects.

/ By body

Standards we supply to

ASTM A106 / A53 / A333

Carbon steel pipe

Seamless & ERW pipe for high-temp (A106), general (A53) and low-temp (A333) service.

ASTM A312 / A358 / A790

Stainless & duplex pipe

Austenitic (TP304/316L) and duplex/super duplex pipe, seamless & welded.

ASTM A335

Alloy (chrome-moly) pipe

P5–P92 for high-temperature refinery, boiler & power service.

API 5L / 5CT / 6D

Line pipe, OCTG & valves

X42–X80 line pipe (PSL1/2), casing & tubing, and pipeline valves.

ASME B16.9 / B16.11

Fittings

Buttweld dimensions (B16.9) and forged socket-weld & threaded (B16.11).

ASME B16.5 / B16.47

Flanges

½–24″ (B16.5) and 26–60″ (B16.47) flange dimensions & ratings.

EN 10216 / 10217 / 1092-1

European metric

Seamless & welded pressure pipe and EN flanges (PN ratings).

AWWA C151 / C207 / C110

Waterworks

Ductile iron pipe, water flanges and fittings for municipal networks.

EN 10204

Certification (MTC)

3.1 & 3.2 material test certificates — traceability & heat numbers.

Sour-service — critical for GCC oil & gas

NACE MR0175 / ISO 15156 — sour-service material

NACE MR0175 / ISO 15156 governs metallic materials for use in H₂S-containing (sour) oil & gas environments. It sets requirements to resist sulphide stress cracking (SSC), hydrogen-induced cracking (HIC) and stress-oriented HIC — through hardness limits (typically ≤ 22 HRC for carbon steel), approved grades, and mandatory testing.

≤ 22 HRC controlled hardnessHIC test NACE TM0284SSC test NACE TM0177L80 / C90 / T95 OCTG316L · Duplex 2205 · Super duplexInconel 625 clad

AAM Steel supplies NACE MR0175-compliant carbon steel, CRA and clad pipe, fittings and flanges with hardness surveys, HIC reports and EN 10204 3.1 / 3.2 certification — for Qatar's and Saudi Arabia's sour-gas projects.

/ Quick reference

Common ASTM ↔ EN grade equivalents

ASTM grade	EN / DIN	Common name	Typical use
TP304 / 304L	1.4301 / 1.4307	304 / 304L	General & food-grade stainless
TP316 / 316L	1.4401 / 1.4404	316 / 316L	Marine, desalination, chemical
TP321	1.4541	321	Stabilised, high-temperature
S31803 / S32205	1.4462	Duplex 2205	Chloride / seawater service
S32750	1.4410	Super duplex 2507	Aggressive warm seawater
A106 Gr B	P235GH / P265GH	Carbon steel	High-temperature process pipe

/ FAQ

Standards — common questions

What is NACE MR0175 / ISO 15156?

The standard governing metallic materials for H₂S-containing (sour) oil & gas service. It sets requirements to resist SSC, HIC and SOHIC — hardness limits (typically ≤ 22 HRC for carbon steel), approved grades and testing (NACE TM0177, TM0284).

What is the difference between ASTM A106 and A53 pipe?

A106 is seamless carbon steel rated for high-temperature service; A53 covers seamless & ERW pipe for general and lower-temperature service. Chemistry is similar for Gr B, but A106 is specified where temperature rating and pressure integrity matter.

What is the EN equivalent of ASTM A312 TP316L?

Grade 1.4404 (X2CrNiMo17-12-2), supplied to EN 10216-5 (seamless) or EN 10217-7 (welded). TP304L corresponds to 1.4307 and TP321 to 1.4541.

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