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End Application Of Steel Grades Produced At Sunflag

Engine / Motor Parts:

Connecting Rod

—SCM 420 H, SCR420H, S35C, S48C, C70S6, 42Cr4Mo2


     —EN207, 45C8

Rocker Arm & Shaft

     —SCr 420H, SCM 420H

Crank Shaft

     —HS20CMS1, S30CMS1, 38MnSiV5/6, S48CS1V, 41Cr4, SCM435, S48C

Crank Pin


Piston Pin Steel Grades

     —15Cr3, 17Cr3, 15CrNi6, EN 353, 16MnCr5, SCM420, SAE8620

Valve Steel Grades

     —21-4N, EN 52

CRDI (Common Rail Distribution Injection) system – Fuel Injector Nozzle Body


Drive Trains – Steering Systems:

Rack & Pinion System Steel Grades

     —SCM 415H, SCM 420 HV, S45C H&T, S45CS1V, S45CS1 H&T

Front Axle Beam & RA Shaft 


Stub Axle Steel Grades

     —40Cr4B, 20MnCr5(B)

Steel for Drives

     —Tulips & Cups : SAE 1050/XC45/ CF53

     —Drive Shaft : 15B41/ 38B3/Ck45


     —Cage: SAE8617/16MnCr5/20MnCr5

Transmissions & Gear Boxes

Gear Steel

     —SCM 415 H/ 420 H, SCr 415 H / 420 H, 20MnCr5 / 16MnCr5, SAE 8620H / EN353

UJ CROSS Steel Grades

     —20MnCr5, EN 353

Axle Shaft Steel Grades

—SAE 15B41H, SAE 1038, S53C, 40Cr4C/B

Bearing Steel grades

     —100Cr6/SAE 52100/SUJ 2

Suspension Systems

Coil Springs

     —SAE 9254/SUP12V/SUP7NV

Stabilizer Bars/ Leaf Springs 

     —SAE 5160/SUP9

ECT For Bars

Acceptance Criteria

Minimum defect depth and length (FBH)

  • 0.7 mm FBH from 15—60 mm dia
  • 1.2 mm FBH above 60 dia

Minimum defect depth and length (SDH)

  • 0.5 mm x 10 mm {from 15—120 mm dia)
  • 0.3 mm SDH sensitivity can deduced by
    extrapolation depending on material SNR.

Phased Array Auto Ultrasonic Testing Salient Features

Phased Array Technology

Phased Array testing is a specialized type of ultrasonic testing that uses sophisticated multi- element array transducers and powerful instrumentation/software to steer ultrasonic beams through the test piece and map returning echoes.

No rotating movement, only electronic scanning is done:

  • Depth focalization for bar volume inspection (LW)
  • Electronic steering for bar surface inspection (SW)

Quality Highlights:

Capacity — 15 to 120 mm dia. Full bar volume inspection

Sunflag R&D Lab Is Equipped With Following State Of The Art Equipment

  • Scanning Electron Microscope with Energy Dispersive X—Ray Spectroscope (SEM—EDS) of Make — JOEL
  • Immersion Ultrasonic Testing Facility of Make — Olympus / Blue Star
  • Optical Microscope with Automatic Multiaxis stage Movement and Image Analysis software
  • Micro—hardness tester
  • Ferritometer
  • NABL Certified Testing Lab
  • R & D Centre Recognised DSIR Government of India

Scanning Electron Microscope With Eds

  • Key Function

– Microstructure analysis
– Quantitative 8L qualitative Analysis of Inclusions

  • Failure Analysis
  • Fractography
  • Inclusion with quantitative elemental analysis

Salient Features

Dimension of samples that can be tested :

– Round Bars :

  • Size 15-120 mm die.
  • Length 800mm
  • Round Corner Square Bars:
  • Size 60420 mm

UST Prob: 10 MHz — 6mm As Per Sep 1927