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Chemical Composition and Mechanical Properties

Chemical Composition

Element P530
P530 HS		 P550 P580 P750 P750I
Carbon max. 0.05 max. 0.06 max. 0.06 max. 0.03 max. 0.03
Manganese 18.50-20.00 20.00-21.60 22.00-24.50 1.50-3.00 1.50-3.00
Chromium 13.00-14.00 18.30-20.00 22.00-24.50 26.50-29.50 26.50-29.50
Molyddenum 0.40-0.60 min. 0.50 max. 1.50 2.00-4.00 2.00-4.00
Nitrogen 0.25-0.40 min. 0.60 max. 0.75 min. 0.20 min. 0.20
Nickel max. 1.50 min. 2.00 max. 2.50 28.00-31.50 28.00-31.50

* P530 HS Compared with P 530 shows higher yield strength
* HS (High strength)
 

Mechanical Properties

Element
 P530 P530 HS P 550 P 580 P750 P750 I*
Yield strength min KSI
3 1/2 to 6 7/8 OD
7" to 11" OD		 110
100		 120
110		 140
130		 140
130		 140
130		 min
155
Tensile strength KSI
3 1/2 to 6 7/8 OD
7" to 11" OD		 120
120		 130
130		 150
150		 150
150		 150
150		 min
160
Elongation min %
3 1/2 to 6 7/8 OD
7" to 11" OD		 25
25		 25
25		 20
20		 20
20		 15
15		 10
10
Reduction of area min. %  50 50 50 50  50  50
Impact energy min. ft. lb.  90 90 60 60 100 80
Hardness - Brinell  260-350 285-365 300-430 350-450 300-400 300-410
Endurance strength
min. KSI/N=107
           /N=105		 -
-		 +/-50
+/-60		 +/-60
+/-80		 +/-60
+/-80		 +/-60
+/-80		  

* Applicable only for dimensions up to OD = max. 5,5 inches Sampling: 1" below surface