ALTA 1.4104 Stainless Steel Properties (X14CrMoS17)

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Martensitic Stainless Steel

ALTA 1.4104 Stainless Steel Specification

Steel properties

ALTA 1.4104 steel has moderate strength and corrosion resistance, and compared to other 17% Chromium martensitic stainless steels, 1.4104 steel's corrosion resistance is weaker due to the addition of sulfur.

The added sulfur gives 1.4104 stainless steel an excellent machinability and a finely ground surface, and it can be used for structural parts in water and steam applications.

(1.4104 +QT650 is available)

Applications

² Automatic lathe parts: such as bolts, nuts and other fasteners processed in large quantities

² Mechanical parts: especially in environments that require high precision and high efficiency processing

² Pumps and pump shafts, valves, piston rods

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Mo	Ni	Cu
Min.	0.10				0.15	15.5	0.20
Max.	0.17	1.00	1.50	0.040	0.35	17.5	0.60	0.25	0.25

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 220 HB (annealed), QT650 (Rm. 650 – 850 Mpa)
Reduction ratio :	5 : 1 minimum or required
Grain size :	≥ 5.0 per ASTM E112
Non-metallic inclusion :	≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route)
Ultrasonic Test	SEP1921, EN 10308, ASTM A388 or agreed methods
Macro-structure	As per ASTM E381
Straightness / flatness	≤ 1.5 mm / m (machined), ≤ 2.5 mm / m (black)
Tolerance	Per discussed
Size range (round bars)	Ø 12 - 500 mm
Size range (flats, plates)	30 - 400 mm in thickness max. 810 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	750 - 850	max. 220 HB

Hot-forming	Temperature(°C)
	800 - 1100

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	990 - 1070	Oil or Air-cooled	550 - 650