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Introduction
ISO 683-11
specifies case-hardening steels designed for components that require a hard,
wear-resistant surface combined with a tough and ductile core. These steels are
typically low-carbon steels that undergo carburizing, quenching, and tempering
to achieve the desired surface hardness while maintaining core strength.
ISO 683-11
steels are widely used in automotive, gear manufacturing, heavy engineering,
and precision mechanical applications. Their ability to provide excellent
fatigue strength, wear resistance, and impact toughness makes them ideal for
high-performance components.
Ladhani
Metal Corporation is a manufacturer, supplier, and stockist of ISO 683-11 case
hardening steel bars, supplying a wide range of grades, sizes, and supply
conditions for industrial and engineering applications.
Applicable Standard
Standard
Specification: ISO 683-11
Issuing Organization: International Organization for Standardization (ISO)
Title: Heat-Treatable Steels, Alloy Steels and Free-Cutting Steels – Part 11:
Case-Hardening Steels
This standard
specifies the requirements for non-alloy and alloy steels intended for case
hardening. It defines chemical composition, delivery conditions, and quality
requirements for steels used in carburized components.
Forms of Supply
ISO 683-11
case hardening steels are available in a variety of product forms.
Round bars
Square bars
Flat bars
Hexagonal bars
Forged bars
Bright bars
Cold drawn bars
Peeled and ground bars
Other forms available:
Wire rods
Sheets
Plates
Coils
Typical supply conditions:
Hot rolled
condition
Annealed condition
Normalized condition
Cold drawn condition
Standard sizes:
Diameter: 10
mm to 500 mm
Length: 3 m to 12 m or cut-to-size
Surface finishes:
Black (mill
finish)
Bright finish
Machined or peeled surface
Grades Covered Under ISO 683-11
Common
case-hardening steel grades include:
C10E, C15E,
C16E
16MnCr5, 20MnCr5
18CrMo4, 20MoCr4
16NiCr4, 20NiCrMo2-2
18CrNiMo7-6
These grades
include both non-alloy and alloy steels designed for carburizing applications.
Chemical Composition of Typical ISO 683-11 Case
Hardening Steel Grades (%)
|
type of steel |
C % |
Si % |
Mn % |
P % max |
S % |
Cr % |
Mo % |
Ni % |
|
C10 |
0.07–0.13 |
0.15–0.40 |
0.30–0.60 |
0.035 |
0.035 max |
– |
– |
– |
|
C15E4 |
– |
– |
– |
– |
– |
– |
– |
– |
|
C15E M2
(2a) |
0.12–0.18 |
0.15–0.40 |
0.30–0.60 |
0.035 |
0.020–0.040 |
– |
– |
– |
|
C16E4 |
– |
– |
– |
– |
– |
– |
– |
– |
|
C16E M2
(3a) |
0.12–0.18 |
0.15–0.40 |
0.60–0.90 |
0.035 |
0.020–0.040 |
– |
– |
– |
|
20Cr4 (4) |
0.17–0.23 |
0.15–0.40 |
0.60–0.90 |
0.035 |
0.020–0.040 |
0.90–1.20 |
– |
– |
|
20CrS4 |
same as
20Cr4 |
same |
same |
same |
0.020–0.040 |
same |
– |
– |
|
16MnCr5
(5) |
0.13–0.19 |
0.15–0.40 |
1.00–1.30 |
0.035 |
0.020–0.040 |
0.80–1.10 |
– |
– |
|
16MnCrS5
(5a) |
same as
above |
same |
same |
same |
0.020–0.040 |
same |
– |
– |
|
20MnCr5
(6) |
0.17–0.23 |
0.15–0.40 |
1.10–1.40 |
0.035 |
0.020–0.040 |
1.00–1.30 |
– |
– |
|
20MnCrS5 |
same as
above |
same |
same |
same |
0.020–0.040 |
same |
– |
– |
|
18CrMo4 (7) |
0.15–0.21 |
0.15–0.40 |
0.60–0.90 |
0.035 |
0.035 max |
0.90–1.20 |
0.15–0.25 |
– |
|
18CrMoS4
(7a) |
same |
same |
same |
same |
0.020–0.040 |
same |
same |
– |
|
15NiCr13
(11) |
0.12–0.18 |
0.15–0.40 |
0.30–0.65 |
0.035 |
0.035 max |
0.60–0.90 |
– |
3.00–3.50 |
|
20NiCrMo2
(12) |
0.17–0.23 |
0.15–0.40 |
0.65–0.95 |
0.035 |
0.020–0.040 |
0.30–0.65 |
0.15–0.25 |
0.40–0.70 |
|
20NiCrMoS2
(12a) |
same |
same |
same |
same |
0.020–0.040 |
same |
same |
same |
|
17NiCrMo6
(13) |
0.14–0.20 |
0.15–0.40 |
0.60–0.90 |
0.035 |
0.035 max |
0.80–1.10 |
0.15–0.25 |
1.20–1.60 |
|
18CrNiMo7
(14) |
0.15–0.21 |
0.15–0.40 |
0.50–0.80 |
0.035 |
0.035 max |
1.50–1.80 |
0.25–0.35 |
1.40–1.70 |
notes:
- elements not quoted in this
table shall not be intentionally added to the steel without agreement of
the purchaser, except for finishing the heat. precautions shall be taken
to avoid residual elements from scrap affecting properties.
- for grades with specified
hardenability requirements, deviations from cast analysis are permissible
except for phosphorus and sulfur. carbon deviation shall not exceed ±0.01
%, other elements as per standard tolerances.
- steels with improved
machinability may be supplied with lead additions or controlled sulphide
morphology on request.
- additional case-hardening
steels, mainly for bearing applications, are covered in iso 683-17.
- steel designations follow
iso/tc 17/sc 2 system; numbers in brackets correspond to former
designation numbers from iso/r 683-11.
- lower silicon content may be
agreed at enquiry/order stage; impact on mechanical properties must be
considered.
Typical
impurity limits:
Phosphorus
(P): 0.025% max
Sulfur (S): 0.035% max
Mechanical Properties of ISO 683-11 Steel Bars
Mechanical
properties depend on heat treatment and case hardening process.
|
Grade |
Core Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
C15E |
500 – 650 |
300 |
20 – 28 |
|
16MnCr5 |
800 – 1000 |
600 |
14 – 18 |
|
20MnCr5 |
900 – 1100 |
650 |
12 – 16 |
|
18CrMo4 |
850 – 1050 |
650 |
12 – 16 |
|
18CrNiMo7-6 |
1000 –
1300 |
800 |
10 – 14 |
After
carburizing:
Surface
hardness: 58 – 62 HRC (typical)
Core remains tough and ductile
Heat Treatment (Case Hardening
Process)
ISO 683-11
steels are specifically designed for case hardening.
Typical
process:
Carburizing
(adding carbon to surface)
Quenching (rapid cooling for hardness)
Tempering (improving toughness)
This results
in:
Hard
wear-resistant surface
Tough, shock-resistant core
Key Features of ISO 683-11 Case Hardening Steel Bars
• Excellent
surface hardness after carburizing
• Tough and ductile core
• High fatigue strength
• Superior wear resistance
• Good impact resistance
• Excellent hardenability (especially alloy grades)
• Reliable performance in dynamic loading conditions
These
features make these steels ideal for critical mechanical components.
Applications of ISO 683-11 Steel Bars
ISO 683-11
case hardening steels are widely used in industries requiring high wear
resistance and fatigue strength.
Automotive Industry
Transmission
gears
Camshafts
Drive shafts
Axles
Pinions
Gear Manufacturing
Spur gears
Helical gears
Gear blanks
Ring gears
Heavy Engineering
Machine
shafts
Wear-resistant components
Industrial gears
Construction Equipment
Heavy-duty
gears
Load-bearing components
Aerospace and Precision Engineering
High-performance
mechanical components
Critical rotating parts
These steels
are especially suitable for parts subjected to continuous friction, wear, and
cyclic stress.
Conclusion
ISO 683-11
case hardening steel bars are high-performance materials designed for
components requiring a hard surface and tough core. Their excellent wear
resistance, fatigue strength, and durability make them ideal for gears, shafts,
and critical mechanical parts.
Ladhani
Metal Corporation supplies ISO 683-11 steel bars in various grades, sizes, and
supply conditions, ensuring high-quality materials for automotive, engineering,
and industrial manufacturing applications.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
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