Our factory is professional manufacturer rolling door flat band spring steel strip over 10 years,which is made with heating treatment with hardened and tempered,that strengthens steel strips through controlling heating and cooling process.which is used to increase the toughnes of the rolling door flat band spring steel strip,what is more,it can make the properties of this rolling door flat band spring steel strip are high strength, hardness,good toughness and abrasion resistance at the same time.therefore,it is mainly used in rolling door springs,rolling shutter springs,band springs,flat springs.etc to make sure the flexibility is better for rolling door spring when the door rolling down and rolling up and the rolling door flat band spring strip steel can't be broken when bending.
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rolling door flat band spring steel strip,surface with polished-blue or natrue blue,hardness with 44-48hrc,rounded edge,the size(thickness&width)
as below
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60 x 1.60
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50 x 1.50
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65 x 1.20
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60 x 1.0
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80 x 1.40
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45 x 1.50
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60 x 1.20
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55 x 1.0
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65 x 1.40
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60 x 1.30
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55 x 1.20
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50 x 1.0
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60 x 1.40
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55 x 1.30
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50 x 1.20
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45 x 1.0
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55 x 1.40
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50 x 1.30
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45 x 1.20
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40 x 1.0
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50 x 1.40
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45 x 1.30
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40 x 1.20
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30 x 1.0
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45 x 1.40
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40 x 1.30
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35 x 1.20
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45x1.1
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40 x 1.40
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1.25x50
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1.25x70
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50x11
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