HSS means hollow steel section. The hollow steel section (HSS) is only composed of structural steel per code. Flat steel plate is gradually changed into different shapes by welding edges like round or circular, elliptical, square, and rectangular during the manufacturing process. Square and rectangular steel hollow sections are sometimes called tube steel or box sections.
Youfa hot sale mild steel hollow section
Mild steel hollow sections, also known as structural steel tube or hollow structural sections, is a type of steel that is formed into a hollow tubular section. Mild steel hollow sections are categorized into three main types: rectangular hollow sections (RHS), square hollow sections (SHS) and circular hollow sections (CHS). Each type of hollow section has its own attributes and serves a specific purpose. Mild steel hollow sections are in both cold formed and hot finished grades, S275 and S355. Mild steel hollow sections are commonly used in a multitude of construction and mechanical applications, where they are used as frames, columns, railings and beams.
Standards and steel grade of steel hollow sections
| Standards | GB/T3091 GB/T13973 |
API 5L ASTM A53 |
ISO65 | BS1387 EN10219 |
DIN2440 | JIS G3444 |
| Equivalent steel grade |
Q195 | GR.A | √ | S195 | S195 | - |
| Q235 | GR.B | - | S235 | - | STK400 | |
| Q355 | GR.C | - | S355 | - | STK490 |
Chemical properties of structural Hollow sections
| Mild steel hollow section Chemical composition, WT≤16mm | |||||||||||
| Standard | Steel grade | C (max.)% | Si (max.)% | Mn (max.)% | P (max.)% | S (max.)% | Cr (max.)% | Ni (max.)% |
Cu (max.)% | N (max.)% | CEV (max.)% |
| GB/T 700-2006 | Q235A | 0.22 | 0.35 | 1.4 | 0.045 | 0.05 | - | - | - | - | - |
| GB/T 700-2006 | Q235B | 0.2 | 0.35 | 1.4 | 0.045 | 0.045 | - | - | - | - | - |
| GB/T1591—2018 | Q355B | 0.24 | 0.55 | 1.6 | 0.035 | 0.035 | 0.3 | 0.3 | 0.4 | 0.012 | 0.45 |
Mechanical properties of structural mild steel hollow sections
| Mechanical properties, WT≤16mm | |||
| Standard | Minimum yield strength MPa |
Tensile strength MPa |
Minimum elongation % |
| GB/T 700-2006 | 235 | 370-500 | 26 |
| GB/T 700-2006 | 235 | 370-500 | 26 |
| GB/T1591—2018 | 355 | 470-630 | 20 |
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Post time: Jul-25-2025