Material: Structural carbon stee GB 700
Structural low alloy steel GB 1591

Standard: ISO 9001-2008 JB 3357 JB/T1615 JB 1152

Specification: Plate > 36mm, Impact toughness >27J
Welding: Height>2. Plate > 36mm, follow the insturction of butt seam inspection method.

Tolerance of Platform & ladder:
Platform: Length 0-2mm per meter, less than 10 mm.
Width: ± 5mm

Test, Check & Acceptance:
1. Visual examination
2. Nondestructive testing
3. Mechanical test & metallographic test.

Painted:
JB/T 1615.