ASTM A269 vs A312 Difference Between ASTM A269 and A312

What is ASTM A269 and ASTM A312 / ASME SA312?

ASTM A269 / A269M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

ASTM A312 / A312M Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipe

Standard Item	ASTM A213	ASTM A269	ASTM A312
Grade	304 304L 304H 304N 304LN 316 316L 316Ti 316N 316LN 321 321H 310S 310H 309S 317 317L 347 347H	304 304L 304H 304N 304LN 316 316L 316Ti 316N 316LN 321 321H 310S 310H 309S 317 317L 347 347H	304 304L 304H 304N 304LN 316 316L 316Ti 316N 316LN 321 321H 310S 310H 309S 317 317L 347 347H
Yield Strength (Mpa)	≥170；≥205	≥170；≥205	≥170；≥205
Tensile Strength (Mpa)	≥485；≥515	≥485；≥515	≥485；≥515
Elongation(%)	≥35	≥35	≥35
Hydrostatic Test	OD(mm) Pressure max (MPa)	OD(mm) Pressure max (MPa)	OD(mm) Pressure max (MPa)
	D<25.4, 7Mpa	D<25.4, 7Mpa	D≤88.9, 17MPa
	25.4≤D<38.1, 10Mpa	25.4≤D<38.1, 10Mpa
	38.1≤D<50.8, 14Mpa	38.1≤D<50.8, 14Mpa
	50.8≤D<76.2， 17MPa	50.8≤D<76.2， 17MPa	D>88.9, 19MPa
	76.2≤D<127， 24MPa	76.2≤D<127， 24MPa
	D≥127, 31Mpa	D≥127, 31Mpa
	P=220.6t/D	P=220.6t/D	P=2St/D S=50%Rp0.2
Intergranular Corrosion Test	ASTM A262 E	ASTM A262 E	ASTM A262 E
Eddy Current Test	ASTM E426	ASTM E426	ASTM E426
O.D. Tolerance (mm)	O.D. and Tolerance	O.D. and Tolerance	O.D. and Tolerance
	D<25.4 +/-0.10	D<38.1 +/-0.13	10.3≤D≤48.3 +0.40/-0.80
	25.4≤D≤38.1 +/-0.15
	38.1<D<50.8 +/-0.20	38.1≤D<88.9 +/-0.25	48.3<D≤114.3 +0.80/-0.80
	50.8≤D<63.5 +/-0.25
	63.5≤D<76.2 +/-0.30	88.9≤D<139.7 +/-0.38	114.3<D≤219.1 +1.60/-0.80
	76.2≤D≤101.6 +/-0.38
	101.6<D≤190.5 +0.38/-0.64	139.7≤D<203.2 +/-0.76	219.1<D≤457.0 +2.40/-0.80
	190.5<D≤228.6 +0.38/-1.14
W.T. Tolerance (mm)	O.D. W.T. Tolerance	O.D. W.T. Tolerance	O.D. W.T. Tolerance
	D≤38.1 WT +20%/-0	D<12.7 WT +/-15%	10.3≤D≤73.0 WT +20.0%/-12.5%
	D>38.1 WT +22%/-0	12.7≤D<38.1 WT +/-10%	88.9≤D≤457.0 t/D ≤5% WT +22.5%/-12.5%
		D≥38.1 WT: +/-10%	88.9≤D≤457.0 t/D >5% WT +15.0%/-12.5%

Differences of ASTM A312 And ASTM A269

Standard	ASTM A312	ASTM A269
Basic Difference	Welded and Seamless Steel Pipe	Welded and Seamless Steel Tubing
Wall Thickness	Average wall thickness (+/-10%)	Average wall thickness (+/-10%)
Applications	Stainless steel pipe for high-temperature and general corrosive service.	Performs well in corrosion resistance and oxidation resistance required in elevated temperature.