Zanglamaydigan po'latdan yasalgan bar uchun CN standartlari

The old BS970 Parts 1 & 3:1991 standards have been replaced by a number of EN Standards, the most important of which are shown below.

CN10088-3 Replaces BS970 Part 1: 1991 & BS970 Part 3: 1991 covering chemical composition & mechanical properties.
CN10058 Tolerances for Hot Rolled Flat Bars CN10059 Tolerances for Hot Rolled Square Bars EN10060 Tolerances for Hot Rolled Round Bars CN10061 Tolerances for Hot Rolled Hexagonal Bars.
CN10278 Tolerances for Bright Bars (Drawn, Turned or Ground).
ISO186 Parts 1 & 2 Tolerance Classifications.

Diameter Tolerances

Smooth Turned

-                                        Diameter (mm)
+                                        Tolerance (mm)
-to 30
+                                        +0/-0.084
-to 50
+                                        +0/-0.100
-to 79
+                                        +0/-0.120

(These are H10 tolerances, which are ‘all minus’ tolerances)

Rough Turned

-                                        Diameter (mm)
+                                        Tolerance (mm)
-to 150
+                                        -0/+1.50
-to 225
+                                        -0/+2.00
-to 410
+                                        -0/+3.00

(These are ‘all plus’ tolerances)

Bright Drawn

-                                        Diameter (mm)
+                                        Tolerance (mm)
-to 10
+                                        +0/-0.036
-to 18
+                                        +0/-0.043
-to 30
+                                        +0/-0.052

These are H9 Tolerances

H9 Tolerances are ‘all minus’ tolerances: +0mm/- Figure in table

Width & Thickness Tolerances

Hot Rolled Square - Width & Thickness

-                                        Size (mm)
+                                        Tolerance (mm) +/-
-to 150
+.50
-to 225
+.00
-to 410
+.00

Hot Rolled Flat - Thickness

-                                        Size (mm)
+                                        Tolerance (mm) +/-
-                                        Up to 20
+.50
-to 40
+.00
-to 80
+.50

Hot Rolled Flat - Width

-                                        Size (mm)
+                                        Tolerance (mm) +/-
-to 40
+.75
-to 80
+.00
-to 100
+.50
-to 120
+.00
-to 150
+.50

Angle Bars

Leg Length

Leg (mm)	Leg Length Tolerance (mm) +/-	Thickness (mm) +/-
20	1.50	0.40
25	1.50	0.50
30	2.00	0.50
40，50	2.00	0.60
60，70，80，90，100	3.00	0.75

Internal Radius

-                                        Leg (mm)
+                                        Maximum Internal Radius (mm)
-，25，30
-，60
-，70，75，80
-，100

ISO 286 Tolerances (in mm)

EXAMPLES:

H8 = Precision Ground

H9 = Bright Drawn

H10 = Smooth Turned

Tolerance (mm) for Given Tolerance Number

Diameter (mm)	6	7	8	9	10	11	12	13
>1 ≤ 3	0.007	0.009	0.014	0.025	0.040	0.040	0.090	0.140
>3 ≤ 6	0.008	0.012	0.018	0.030	0.048	0.048	0.120	0.180
>6 ≤ 10	0.009	0.015	0.022	0.036	0.058	0.090	0.150	0.220
>10 ≤ 18	0.011	0.018	0.027	0.043	0.070	1.110	0.180	0.270
>18 ≤ 30	0.013	0.021	0.033	0.052	0.084	0.130	0.210	0.330
>30 ≤ 50	0.016	0.025	0.039	0.062	0.100	0.160	0.250	0.390
>50 ≤ 80	0.019		0.046	0.074	0.120	0.190	0.300	0.460
>80 ≤ 120	0.022			0.087	0.140	0.220	0.350	0.540
>120 ≤ 180	0.025			0.100	0.160	0.250	0.400	0.630
>180 ≤ 250				0.115	0.185	0.290	0.460	0.720
>250 ≤ 315						0.320	0.520	0.810
>315 ≤ 400						0.360	0.570	0.890
>400 ≤ 500						0.400	0.630	0.970
>500						0.440	0.700	1.100

Straightness Tolerances for Bright Bars

Taken from BS EN 10278:1999, applicable to Bright Bars only.

Method of measuring deviation - Preferred Method B.1 from BS EN 10278:

The bar shall be supported on a suitable surface so as to eliminate or minimise sagging.
A 1 metre long straight edge shall be placed on the surface of the bar at any position along it’s length. No part of the straight edge shall be within 150mm of the ends of the bar.
Straightness shall be determined by measuring the gap between the bar and the straight edge by suitable means such as a feeler gauge.

Deviation from Straightness

Product	Dimension	Maximum Deviation (mm) Within a 1m Length Measured at Least 150mm from Either End of Bar
Round		1.0mm
Square & Hexagon	≤75mm	1.0mm
Square & Hexagon	>75mm	1.5mm
Flat	Width <120mm	On Width: 1.5mm
Flat	Width <120mm	On Thickness: 2.0mm
Flat	Width ≥120mm	On Width: 2.0mm
Flat	Width/Thickness <10.1	On Thickness: 2.5mm
Flat	Width ≥120mm	On Width: 2.500

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