1) A178 Chemical Component Analysis(%): 
     Gr. A: C: 0.06-0.18;  Mn: 0.27-0.63;   P: < 0.035; S: < 0.035;
     Gr. C: C: < 0.35;  Mn: < 0.80;   P: < 0.035; S: < 0.035;
     Gr. D: C: < 0.27;  Mn: 1.00-1.50;   P: < 0.030;  S: < 0.015; Si: > 0.10

2) Tensile Requirements: 
     Gr. A: Tensile strength Min. 47Ksi; Yield Strength Min. 26Ksi, Elongation: 35%.
     Gr. C: Tensile strength Min. 60Ksi; Yield Strength Min. 37Ksi, Elongation: 30%.
     Gr. D: Tensile strength Min. 70Ksi; Yield Strength Min. 40Ksi, Elongation: 30%.

3) Manufacture Method: Electric-Resistance Welding;

4) Surface treatment: ASTM A178 & ASTM A450-Temporary Coating, Special Coating, Galvanized, immersion oil, lacquer, passivation, phosphating,etc; Or Oil-dip paint black with two plastic caps on each end

5) Quality Test: ASTM A450-Chemical Component Analysis,Mechanical Properties(Ultimate tensile strength,Yield strength,Elongation),Technics Properties(Flattening Test,Flaring Test,Bending Test,Hardness Test,Blow Test,etc), Exterior Size Inspection, Nondestructive electric Test,Hydrostatic Test,  magnetic particle testing;

6)  Packing: Hexagonal bundles with several steel strips, Wrapped in waterproof paper, PVC sleeve,and sackcloth with several steel strips or packed in heavy tri-wall boxes, wooden boxes, wooden slats as requires;

7) Applications:  Boiler and Heat Exchanger(Wal panel,economizer,reheater,superheater and steam pipeline of boilers), Hydraulic and Petrochemical Purpose, etc.

8) Origin: China