• Specification：OD6-350mm
• Transport Package：in Bundle, in Bulk or as Request
• Available Grades：St30 Si, St30 Al, St35, St45, St52.
• Technical：Cold Drawn,Cold Rolled
• Shape：Round
• Wt：0.8-50mm
• Section Shape：Round
• Usage：Hydraulic,Automobile Pipe, Machinery Industry
• Model NO.：DN50
• Trademark：Kingmetal
• Origin：China
• HS Code：7304519090
• Production Capacity：1500ton,Month

Cold drawn(Mandatory)

Cold drawn(Soft)

Cold Drawn and Stress Release

Normalizing

Anneal

BK¹⁾

BKW¹⁾

(BKS)

(NBK)¹⁾

(GBK)¹⁾

Grade

Tensile

Elongation

Tensile

Elongation

Tensile

Yield point

Elongation

Tensile

Yield point

Elongation

Elongation

Tensile

N/mm²

%

N/mm²

%

N/mm²

N/mm²

%

N/mm²

N/mm²

%

%

N/mm²

St35

480

6

420

10

420

315

35

340~470

  DesignationSymbolDescriptionCold finished (hard)BKTubes do not undergo heat treatment following the final cold forming and thus, have a rather high resistance to deformation.Cold finished (soft)BKWThe final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding).Cold finished and stress-relievedBKSHeat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.AnnealedGBKThe last cold forming process is followed by annealing in a controlled atmosphere.NormalizedNBKThe last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.