DIN FASTENER MATERIAL GRADES

HEAT TREATMENT & METALLURGY

(Engineer-Focused | Auditor-Ready | Export-Critical)
Manufactured by – Super Industries India

✅ IMPORTANCE: EXTREMELY HIGH

(This page builds buyer trust, passes audits, and supports international tenders)

1. Why Material & Metallurgy Matter in DIN FASTENER MATERIAL GRADES

In DIN fasteners, geometry alone is not enough. The material grade, heat treatment process, and metallurgical structure determine:

✔ Load-bearing capacity
✔ Fatigue life
✔ Corrosion resistance
✔ Safety in service

At Super Industries India, fasteners are engineered from certified raw materials, processed under controlled heat treatment cycles, and tested as per DIN requirements.

2. DIN Material Classification – Overview

DIN fasteners are commonly manufactured from:

1. Carbon Steel
2. Alloy Steel
3. Stainless Steel
4. Special Engineering Steels

Each category is selected based on application load, environment, and service life.

3. Carbon Steel Grades Used in DIN Fasteners

Common DIN Carbon Steels

DIN Material	Equivalent	Typical Use
C15	EN 1.0401	Low-load bolts
C35	EN 1.0501	General fasteners
C45	EN 1.0503	High-strength bolts

Characteristics

✔ Cost-effective
✔ Good machinability
✔ Suitable for zinc / HDG coating

4. Alloy Steel Grades (High Strength DIN Fasteners)

Popular Alloy Steels

Steel Grade	Alloy Content	Application
42CrMo4	Cr-Mo	Structural bolts
35CrMo	Cr-Mo	Stud bolts
25CrMo4	Cr-Mo	Pressure systems

Benefits

✔ High tensile strength
✔ Excellent fatigue resistance
✔ Suitable for class 10.9 / 12.9

5. Stainless Steel for DIN Fasteners

Common Stainless Grades

DIN Grade	Equivalent	Corrosion Resistance
A2 (304)	EN 1.4301	Good
A4 (316)	EN 1.4401	Excellent

Typical Applications

• Marine
• Chemical plants
• Food processing

6. Mechanical Property Classes (DIN Strength Grades)

Property Class	Tensile Strength (MPa)	Yield Strength (MPa)
4.6	400	240
8.8	800	640
10.9	1040	940
12.9	1220	1100

7. Heat Treatment Processes (CRITICAL SECTION)

Common Heat Treatments

✔ Quenching & Tempering
✔ Normalizing
✔ Stress relieving

Purpose

• Achieve required hardness
• Improve toughness
• Prevent brittleness

8. Heat Treatment Cycle Control

At Super Industries India, we control:

✔ Furnace temperature
✔ Holding time
✔ Cooling rate

This ensures consistent mechanical properties across batches.

9. Metallurgical Structure & Grain Flow

Why Grain Flow Matters

✔ Improves fatigue life
✔ Prevents crack propagation

Process Used

• Hot forging
• Controlled rolling

10. Case Hardening vs Through Hardening

Feature	Case Hardened	Through Hardened
Surface hardness	High	Medium
Core toughness	High	Moderate
Typical use	Screws	Structural bolts

11. Hardness Testing Methods

✔ Rockwell (HRC)
✔ Brinell (HB)
✔ Vickers (HV)

12. Hydrogen Embrittlement Control

Risk Factors

✔ Electroplating
✔ High tensile grades

Preventive Measures

✔ Baking after plating
✔ Controlled acid cleaning

13. Corrosion Resistance vs Strength Trade-off

Higher strength = higher embrittlement risk
Higher corrosion resistance = lower tensile strength

👉 Correct material selection is critical

14. Material Traceability System

✔ Heat number stamping
✔ Mill test certificates
✔ Batch-wise records

15. Third-Party Inspection & Compliance

✔ EN 10204 – 3.1 / 3.2
✔ SGS / TUV / BV
✔ Client witness testing

16. Export Compliance

✔ RoHS
✔ REACH
✔ Country-specific norms

17. DIN vs ISO vs ASTM – Material Philosophy

Standard	Focus
DIN	Engineering precision
ISO	Global harmonization
ASTM	Application-based

18. Custom Material Solutions

We offer:
✔ Non-standard alloys
✔ Project-specific grades
✔ Heat treatment customization

19. Why Engineers Choose Super Industries India

✔ Metallurgy-first manufacturing
✔ Full traceability
✔ Export documentation support

20. CTA

📩 Request material selection guidance or test reports today.