EN -353

Description

EN353  is a premium quality, case-hardening alloy steel bar known for its exceptional core strength and wear resistance. The term refers to its smooth, shiny, and scale-free surface finish, which is achieved through cold processing techniques like drawing, peeling, or grinding.
Here is a detailed breakdown of its key characteristics:

1. Dual-Core Engineering

The core feature of EN353 is its ability to undergo case hardening (carburising). This process creates a dual-layer structure:
    • The Case (Outer Layer): Becomes extremely hard and wear-resistant to withstand heavy friction.
    • The Core (Inner Layer): Remains highly ductile and tough to absorb shock, vibration, and impact without cracking.

2. High Machinability & Precision

Because it is cold-processed into a "bright" finish, the steel offers:
    • Tight Tolerances: It is dimensionally accurate (often h9 or h11 grade), making it ready for use in automated CNC machines without extra surface cleaning.
    • Cost Efficiency: Reduces tool wear and machining time compared to hot-rolled black bars.

3. Structural Toughness

Enhanced with nickel, chromium, and molybdenum, this steel possesses superior mechanical strength. It maintains excellent tensile strength (800–1100 N/mm²) and high fatigue resistance under heavy cyclic loads.

4. Typical Use Cases

It is highly favored in the automotive, defense, and heavy machinery industries for manufacturing:
    • High-stress gears and pinions
    • Shafts and axles for transmissions
    • Heavy-duty pins, valves, and gudgeons

EN353 Grade Introduction:

We are EN353 Steel Bright Round Bar manufacturers and we are manufacturing from prime quality billets and blooms. The range of EN353 Round Bars which we manufacture for our customers are of high quality and these round bars are used for making machinery and Auto components. These products have been made keeping in mind the quality parameters which have been set by the industry in the market. EN353 Round Bars are always supplied with the test certificates and can be supplied in bulk quantity as well as retail quantity as per customer’s requirements. EN353 alloy Steel round bars are supplied by us to various industries.

EN353 is a very high strength steel alloy which is hardened and tempered before supplying and has nickel, chromium, molybdenum making it high tensile steel strength, with good ductility and wear resistance. With relatively good impact properties at low temperatures, EN353 is also suitable for a variety of elevated temperature applications. EN353 round bars have good internal strength and high external strength, which makes it highly wear resistant. EN353 steel round bars offer good combination of ductility, strength and wear resistance. EN353 is a very high strength alloy engineering steel.

EN353 Grade Application:

Acceptable for many automobile applications such as heavy duty gear, shaft, pinion, camshafts, gudgeon pins.

EN353  Equivalent grades:

BRITISH BS 970:1991 815M17
BRITISH BS 970:1955 EN353
GERMAN DIN 20NiCrMo5
FRENCH AFNOR 20NCD5
SWEDISH SS 2523
EUROPEAN STEEL NAME 17NiCrMoS6-4
EUROPEAN STANDARD EN10277-4

Addition to othergrades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS M2, M35, M42, DIN-1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTM SA-105 , SAE1018, SAE1010, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.

EN353 Hardness:

HB – 270

EN353  Heat treatment:

The hardening treatment for most steels consists of heating the steel to a set temperature and then cooling it rapidly by plunging it into oil, water. EN8 and EN353 steel is an easily available and cheap material that is acceptable for heavy duty applications.

EN353  Hardening:

Hardening °C 780-820.
EN353  Tempering:
EN353 is re-heated  to 780C – 820°C, holding until  the temperature is uniform throughout the section, and then  quenched  in oil, Tempering must be done  immediately while  the component EN353 is still hand warm. Heat to 150C – 200°c , soak it  for 1 – 2 hours / 25mm of section, and then  cooled  in still air. Hardness after Tempering  : 62-64 HRC.

EN353  Forging Properties:

EN353 steel round bars offer good combination of ductility, strength and wear resistance. EN353 is a very high strength alloy engineering steel.

EN353  Stress Reliving:

justify150-200, cooled in furnace.
1st pre-heating °Cup to approx. 400 in an air-circulating furnace
2nd and 3rd : 780 and 805°C.

EN353  Normalizing:

EN353  Annealing:

630-670°C
EN353 Bright Bar · wyasa style
EN353
Chemical composition wt. %
Element C Si Mn P S Cr Mo Ni
Content (%) 0.10–0.20 0.10–0.35 0.50–1.00 0.040 Max 0.040 Max 0.75–1.25 0.08–0.15 1.00–1.50
Mechanical properties heat treatment & hardness
Property Value / Details
Hardening 840–870 °C
Quenching oil
Tempering 150–200 °C
Brinell Rockwell Hardness 150–200
EN353 · complete data · wyasa style
EN353 · COMPLETE DATA
Other details of property ruling section · tensile · yield · etc.
Annealed R S T U V W Y
Ruling Section (mm) 150 150 100 65 65 30 25
Tensile Strength (MPa) 680/720 690/850 770/930 850/1000 930/1080 1000/1160 1080/1240
Yield Stress (MPa) 440/480 480 570 665 740 835 895
Elongation (% Min) 22 15 15 13 12 12 10
ISO V Impact (Joule) 30 30 30 30 25 25 22
Hardness (Brinell) 190/210 201/255 223/277 248/302 269/321 293/341 311/375
Proof Stress (0.2%) if required (MPa, Min) — 495 550 630 710 770 850
Thermal conductivity W/(m·K)
Thermal Conductivity at °C 20 350 700
W/(m·K) 11.3 13.3 14.5
Density g/cm³ · lb/in³
DENSITY (G/CM³) DENSITY (LB/IN³)
8.08 0.292
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⚙️ Density: 7.85 g/cm³ (7850 kg/m³)

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