| BS EN 10025-2 | 2004 | S | 355 | J2 |
| S | = | Structural Steel |
| 235 | = | Min. Yield Strength in MPa | |
| 275 | = | Min. Yield Strength in MPa | (Mild Steel) |
| 355 | = | Min. Yield Strength in MPa |
| Mild Steel Mild steel is the most common form of steel because its price is relatively low whilst it provides material properties that are acceptable for many applications. This steel usually contains less than 0.25% of carbon and insignificant amounts of alloying elements. The material exhibits good weldability properties and is used in most general fabrication and structural steel applications. |
| High Yield Steel High yield steel is another low carbon steel also typically containing less than 0.25% of carbon but the steel strength is increased through the addition of manganese and/or vanadium. This type of steel can also be further enhanced through small additions of molybdenum, niobium and titanium. This material again exhibits good weldability properties and is used in more demanding structural applications. |
| Structural Steel |
| S235JR |
| S235JO |
| S235J2 |
| S275JR |
| S275JO |
| S275J2 |
| S355JR |
| S355JO |
| S355J2 |
| S355K2 |
Steel Grade Comparison Table
| Current Standard | Previous Standards | American | Canadian | Japanese | |
| EN 10025-2 2004 | DIN 17100 | BS 4360 | ASTM | CSA G 40-21 | JIS G 3101 JIS G 3106 |
| S235JR | RSt37-2 | 40B | |||
| S235J0 | St37-3U | 40C | |||
| S235J2 | |||||
| A36 | 260W | SS400 | |||
| SM400 | |||||
| A/B/C | |||||
| S275JR | St44-2 | 43B | SS400 | ||
| S275JO | ST44-3U | 43C | |||
| S275J2 | |||||
| S355JR | 50B | A572 | 350W | SS490 | |
| Gr50 | |||||
| A992 | |||||
| Gr50 | |||||
| S355JO | St52-3U | 50C | |||
| S355J2 | |||||
| S355K2 |
Engineering Bar Grades – Chemical And Mechanical Properties
| Chemical Analysis | Min % / Max % | Mechanical Properties | Minimum Values | |
| S355J2/ EN10025-2 | ||||
| Chemical Analysis | Yield N/mm2 | UTS N/mm2 | Elongation % | |
| Carbon | 0.20 max | 355 | 470 – 630 | 18 |
| Silicon | 0.55 max | |||
| Manganese | 1.60 max | |||
| Phosphorous | 0.025 max | |||
| Sulfur | 0.025 max |
| High Yield Steel High yield steel embodies exceptional performance under extreme structural loads. Tension, compression, impacts, abrasion and vibration are usual loads applied upon heavy industry components when in operation. These actions can lead to substantial deformation, structural displacement and mechanical failure where materials are not prepared to withstand the unique stress values of specific applications and working environments. |
| The Importance of Yield Strength A materials capacity to endure structural loads up to the point of failure is measured as its yield strength. Several materials show plastic deformation under stress, which refers to a momentary elasticity caused by strain. Irreparable deformation or fracture happens at the limit of this elasticity, leading to permanent deformation or mechanical failure. This concept is measured in pound-force per square inch (psi), or megapascals (Mpa). High yield steel is developed to offer enhanced resistance to an array of structural loads, in order to endure the severe actions innate in some of the most demanding applications on earth. Structural-grade steel, heavy-load transporters, construction and engineering equipment, and offshore facilities all make pervasive use of high yield steel to guarantee the highest component or facility longevity in the face of exceptional load stresses. |
| High Yield Steel Strengths High yield steel is developed to offer incomparable strength values post heat treatment and mechanical profiling. Steel alloys commonly show a decrease in mechanical properties after quenching and tempering, but high yield steel is regularly suited for heat treatment and bending with no substantial drop in the yield behaviour of the material. This is partly because of the alloying content of the steel grades which usually include low to high contents of titanium (Ti) and medium to ultra-high molybdenum (Mo) levels. |
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