| Steel Grade | DIN StE380(S380N) |
| Material No. | 1.8900 |
| CHEMICAL COMPOSITION | |
| C(％)≤ | 0.2 |
| Si(％) | 0.10～0.60 |
| Mn(％)≤ | 1.00～1.70 |
| P(％)≤ | 0.035 |
| S(％)≤ | 0.03 |
| N(％)≤ | 0.02 |
| Al(％) | 0.02 |
| Cr(％)≤ | 0.3 |
| Cu(％)≤ | 0.20② |
| Mo(％)≤ | 0.08② |
| Ni(％)≤ | 1 |
| Nb(％)≤ | 0.05 |
| Ti(％)≤ | —⑤ |
| V(％) | 0.2 |
| Nb+Ti+V(％)⑥ | 0.22 |
| MECHANICAL PROPERTIES | |
| Tensile Strength|σb/Mpa (≤70mm) |
500～650 |
| Tensile Strength|σb/Mpa (70-85mm) |
490～640 |
| Tensile Strength|σb/Mpa (85-100mm) |
480～630 |
| Tensile Strength|σb/Mpa (100-125mm) |
470～620 |
| Tensile Strength|σb/Mpa (125-150mm) |
460～610 |
| Normal Temp Yield Strength|σ/MPa(≤16mm) | 380 |
| Normal Temp Yield Strength|σ/MPa(16-35mm) | 375 |
| Normal Temp Yield Strength|σ/MPa(35-50mm) | 365 |
| Normal Temp Yield Strength|σ/MPa(50-60mm) | 355 |
| Normal Temp Yield Strength|σ/MPa(60-70mm) | 345 |
| Normal Temp Yield Strength|σ/MPa(70-85mm) | 335 |
| Normal Temp Yield Strength|σ/MPa(85-100mm) | 325 |
| Normal Temp Yield Strength|σ/MPa(100-125mm) | 315 |
| Normal Temp Yield Strength|σ/MPa(125-150mm) | 305 |
| Extensibility|δ5≥(％) | 20 |
| Flexual Center Dia Cold-bend Test(180℃/L) | 2.5a |
| Flexual Center Dia Cold-bend Test(180℃/T)⑥⑦ | 3.5a |
| Sample Direction L/T⑧⑨ | L/T |
| Ballistic|αkv≥(J/cm^2) (+20℃) |
55/31 |
| Ballistic|αkv≥(J/cm^2)(+10℃) | 51/31 |
| Ballistic|αkv≥(J/cm^2)(+0℃) | 47/31 |
| Ballistic|αkv≥(J/cm^2)(-10℃) | 43/24 |
| Ballistic|αkv≥(J/cm^2)(-20℃) | 39/21 |
| Ballistic|αkv≥(J/cm^2)(-30℃) | —/— |
| Ballistic|αkv≥(J/cm^2)(-40℃) | —/— |
| Ballistic|αkv≥(J/cm^2)(-50℃) | —/— |
| Ballistic|αkv≥(J/cm^2)(-60℃) | —/— |
| Remark: | ||||||||||||||||||||||||||||||
| ①, It is European standard steel grade in parenthesis, it have been revised by DIN EN 10028-5+6(1997) and DIN EN 10113(1993) | ||||||||||||||||||||||||||||||
| ②, The balance of Cr+Cu+Mo is under 0.45％. | ||||||||||||||||||||||||||||||
| ③, When the steel have Cu element, then the Cu is under 0.70％. | ||||||||||||||||||||||||||||||
| ④, When the steel have Ni element, then the Ni is under 0.85％. | ||||||||||||||||||||||||||||||
| ⑤, When the steel have Ti element, then the Ti is under 0.20％. | ||||||||||||||||||||||||||||||
| ⑥, a-->Testing sample thickness. | ||||||||||||||||||||||||||||||
| ⑦, When the thickness is more than 70mm, the flexual center diameter is 0.5a. | ||||||||||||||||||||||||||||||
| ⑧, The testing sample is V form according to ISO. | ||||||||||||||||||||||||||||||
| ⑨, This result apply to the thickness which is from 10mm to 150mm, and it is average value of three samples. | ||||||||||||||||||||||||||||||
