ALTA 1.4028 Stainless Steel Properties (X30Cr13, 420B)

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Martensitic Stainless Steel

ALTA 1.4028 Stainless Steel Specification

Steel properties

ALTA 1.4028/30Cr13 is a high Chromium martensitic stainless steel. This steel has higher strength, hardness and hardenability than 1.4021/20Cr13 steel after quenching. It has a certain corrosion resistance to dilute nitric acid and weak organic acid at room temperature, but not as good as 1.4021 steel.

Applications

² Used for high-strength parts and wear parts that bear high stress loads and work in a certain of corrosive media, such as tools and springs working below 300°C, shafts, bolts, valves, bearings working below 400°C, etc

² Also used as measuring instruments, medical tools, etc

Chemical composition

Chemical Composition per %

	C	Si	Mn	P	S	Cr	Ni	Cu
Min.	0.26					12.0
Max.	0.35	1.00	1.50	0.030	0.030	14.0	0.25	0.30

Basic melting process :

IM/EAF + LF + VD + (ESR)

Hardness :	Max 235 HB (annealed)
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 - 600 mm
Size range (flats, plates)	8 - 450 mm in thickness max. 1100 mm in width

Heat treatment

Annealing	Temperature(°C)	Hardness
Annealing	745 - 825	max. 235 HB

Hot-forming	Temperature(°C)
	800 - 1100

Hardening and tempering	Quenching temperature(°C)	Quenching medium	Frequently-used tempering temperature(°C)
Hardening and tempering	850 - 1050	Oil	625 - 675