Physical Properties of 347/347H Alloys in the Annealed Condition at -20°F to +100°F

			Tensile Strength			Yield Strength
Alloy	UNS Designation	Spec.	psi	MPa	ksi	psi	MPa	ksi	Elongation in 2 inches (min.) %	Grain Size Req.	Maximum Harndess	Modulus of Elasticity(x106psi)	Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6)	Thermal Conductivity (BTU-in/ft2-h-°F)
347	S34700	—	75,000	515	—	30,000	205	—	35	—	—	29.0	9.2	—
347H	S34709	—	75,000	515	—	30,000	205	—	35	7 or coarser	—	29.0	9.2	—

Composition of 347/347H tubing and pipe

Grade	347	347H
UNS Designation	S34700	S34709
Carbon (C) Max.	0.08	0.04–0.10
Manganese (Mn) Max.	2.00	2.00
Phosphorous (P) Max.	0.04	0.04
Sulphur (S) Max.	0.03	0.03
Silicon (Si) Max.	0.75	0.75
Chromium (Cr)	17.0–20.0	17.0–20.0
Nickel (Ni)	9.0–13.0	9.0–13.0
Molybdenum (Mo)	—	—
Nitrogen (N)	—	—
Iron (Fe)	Bal.	Bal.
Other Elements	Cb+Ta=10xC-1.0	Cb+Ta=8xC-1.0

347/347H Product Range

Alloy	UNS Designation	Werkstoff NR.	Specifications*
347	S34700	1.4550	A269, A/SA249, A/SA312
347H	S34709	—	A/SA249, A/SA312