Chromium Content

Chrome Steel

Chromium is a hard metal that adds corrosion resistance when alloyed with steel. Alone, it polishes to a mirror-like shine - that's why it's often used as decorative plating, where it's called "chrome." For oil and gas industry steel products, Continental adds varying quantities of chromium to molten steel to create the best and most cost-effective alloy solutions.

Chromium Content

Chrome Steel Grades

Commonly called chrome, the alloy referred to here is actually chromium. Chromium is added to steel in small quantities to improve strength, corrosion resistance and response to heat treatment. At 3% to 10% chromium, steel resists corrosion, but is not actually stainless. At 10.5% to 20% or more chromium, the steel is fully stainless. Chrome, super-chrome and hyper-chrome are steels below the stainless level with increasing chromium content. These metals are used in mildly corrosive environments containing chlorides, carbon dioxide and low hydrogen sulphate concentrations.

Key Characteristics

Higher chromium content than alloy steels
Improved corrosion resistance
Cost-effective alternative to stainless
Better resistance in CO2 and mild chloride environments
Superior to carbon steel in corrosive conditions

Applications

CO2 environments
Mildly saline conditions
Low hydrogen sulphate exposure
Oil and gas wellbores
Moderate corrosion resistance requirements

13CR (420 Mod)

Mechanical Bar & Tube

Composition:

Element	Min %	Max %
C	0.18	0.22
Mn	0.4	1
Mo	-	0.5
Cr	12.5	14
Ni	-	0.2
Cu	-	0.2
P	-	0.02
S	-	0.005
Si	-	0.8
V	-	1

Mechanical Properties	Metric	Imperial
Tensile Strength	689 MPa min	100,000 psi min
Yield Strength	552 MPa min 655 MPa max	80,000 psi min 95,000 psi max
Total Elongation Under Load	20.000 %	-
Hardness	22 Max HRC	-

25CR

Mechanical Bar & Tube

Composition:

Element	Min %	Max %
C	-	0.025
Mn	-	0.8
Mo	3	4
Cr	24	26
Ni	-	8
Cu	-	2
P	-	0.025
S	-	0.002
Si	-	0.8

Mechanical Properties	Metric	Imperial
Tensile Strength	814 MPa min	118,000 psi min
Yield Strength	586 MPa min	85,000 psi min
Total Elongation Under Load	30.000 %	-
Hardness	28 Max HRC	-

9CR

Mechanical Bar & Tube

General purpose pipe manufactured to ASTM Specification 519. Similar to 4140 (which has a lower carbon level), 9CR has improved hardenability and is more commonly used in the higher strength >= 110ksi condition.

Composition:

Element	Min %	Max %
C	0.09	0.15
Mn	0.3	0.6
Mo	0.9	1.1
Cr	8	10
Ni	-	0.25
Cu	-	0.25
P	-	0.02
S	-	0.01
Si	-	1
Al	-	0.04

Mechanical Properties	Metric	Imperial
Tensile Strength	689 MPa min	100,000 psi min
Yield Strength	552 MPa min 655 MPa max	80,000 psi min 95,000 psi max
Total Elongation Under Load	20.000 %	-
Hardness	22 Max HRC	-

S13CR Nace Equiv.

Mechanical Bar & Tube

Composition:

Element	Min %	Max %
C	-	0.03
Mn	-	1
Mo	1.5	2.5
Cr	11.5	13.5
Ni	-	6
Ti	-	0.5
P	-	0.02
S	-	0.005
Si	-	0.5
V	-	0.5

Mechanical Properties	Metric	Imperial
Tensile Strength	724 MPa min	105,000 psi min
Yield Strength	655 MPa min 827 MPa max	95,000 psi min 120,000 psi max
Total Elongation Under Load	20.000 %	-
Hardness	28 Max HRC	-

Element	Min %	Max %
C	-	0.03
Mn	-	1
Mo	1.5	2.5
Cr	11.5	13.5
Ni	-	6
Ti	-	0.5
P	-	0.02
S	-	0.005
Si	-	0.5
V	-	0.5

Mechanical Properties	Metric	Imperial
Tensile Strength	862 MPa min	125,000 psi min
Yield Strength	758 MPa min 965 MPa max	110,000 psi min 140,000 psi max
Total Elongation Under Load	15.000 %	-
Hardness	32 Max HRC	-

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