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3945 Quality Sheet Specification
High, medium strength steels for automotive industry, mostly for discs
Reproducible Letter Symbols --> HRP --> HRPKK --> HRU --> HRUKK --> LP --> LPKK --> LR --> LRKK --> RD --> RKK --> RP --> RPD --> RPK
Flat / Hot Rolled
Flat steel products are obtained by heating semi-finished products with a rectangular cross-section (slab), which are produced by the continuous casting method, to a specific temperature and then rolling them, with thicknesses ranging from 1.40 to 25.40 mm and widths ranging from 700 to 2025 mm, produceed as coil or by cutting/slit-coiling flat steel products from coils.
High, medium strength steels for automotive industry, mostly for discs
Chemical Composition (%)
| Standard Equivalent | Erdemir Grade No | Cmax. | Mnmax. | Pmax. | Smax. | Cumax. | CEmax. | |
|---|---|---|---|---|---|---|---|---|
| Standard | Quality | |||||||
| EN 10025-2:2019 | S275J2 | 3945 | 0.18 | 1.50 | 0.025 | 0.025 | 0.55 | 0.40 |
- Max carbon equivalent (CE) is increased by 0.01 % for Si ≤ 0.25%, and 0.02 % for Si ≤ 0.04 %
- The maximum value for nitrogen does not apply if the chemical composition shows a minimum total aluminium content of 0.020%. Minimum aluminium to nitrogen ratio is 2:1.
- Carbon equivalent, CEV (IIW) % = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15
- If Cu %: 0.25-0.40, max carbon equivalent (CEV) is increased 0.02 % within the framework of agreements with customers.
Mechanical Properties
| Standard Equivalent | Erdemir Grade No | Re [N/mm2] t(thickness, mm) | Rm [N/mm2] t(thickness, mm) | A(%) min. t(thickness, mm) | Impact | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Quality | ||||||||||||||||
| 1.39≤t≤16 | 16.01≤t≤25 | 1.39≤t≤2.99 | 3≤t≤25 | A801.39≤t≤1.5 | A801.51≤t≤2 | A802.01≤t≤2.5 | A802.51≤t≤2.99 | A53≤t≤25 | Temperature ( ° C)6≤t≤7.49 | KVC J min.6≤t≤7.49 | Temperature ( ° C)7.5≤t≤9.99 | KVC J min.7.5≤t≤9.99 | Temperature ( ° C)10≤t≤25 | KVC J min.10≤t≤25 | |||
| EN 10025-2:2019 | S275J2 | 3945 | 275 min. | 265 min. | 430-580 | 410-560 | 14 | 15 | 16 | 17 | 21 | -20 | 14 | -20 | 21 | -20 | 27 |
- Impact test is not carried out for thickness thinner than 6 mm.
- Could be normalized or equivalent to normalized rolling.
- This grade is produced according to reference mechanical values above in line with agreements with customers.
- Tensile test values apply to "transverse" test pieces