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Round Steel Tube

Round Steel Tube

Chrome Plated ID Tubing Wholesaler

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Specifications of Honed ID Steel Tubes

Processing method	Cylinder inner diameter (mm)	Length (m)	Straightness (mm/m)	Inner diameter dimension accuracy	Wall thickness difference	Inner hole roughness (μm)
Cold drawing	40-320	≤12m	0.2-0.5	H8-H10	±5%	0.8-1.6
Cold rolling	30-100	≥12m	0.2-0.5	H8-H10	±5%	0.8-1.2
Cold drawing honing	40-500	8m	0.2-0.3	H8-H9	±5%	0.2-0.8
Cold drawing rolling	40-400	7m	0.2-0.3	H8-H9	±5%	0.2-0.4
Deep hole boring honing	320-400	8m	0.2-0.3	H8-H9	±8%	0.2-0.8
Deep hole boring rolling	320-400	7m	0.2-0.3	H8-H9	±8%	0.2-0.4

Inner diameter dimension tolerance GB1801-99

Inner diameter size mm	Inner diameter deviation μm
Inner diameter size mm	H7	H8	H9	H10
30	+21 0	+33 0	+52 0	+84 0
>30－50	+25 0	+39 0	+62 0	+100 0
>50－80	+30 0	+46 0	+74 0	+120 0
>80－120	+35 0	+54 0	+87 0	+140 0
>120－180	+40 0	+63 0	+100 0	+160 0
>180－250	+46 0	+72 0	+115 0	+185 0
>250－315	+52 0	+81 0	+140 0	+210 0
>315－400	+57 0	+89 0	+170 0	+230 0

Mechanical properties

Steel grade	Tensile strength σbN/mm²	Yield strength σsN/mm²	Elongation △5%	Hardness HB
20#	530	505	12	175
45#	660	630	6	207
16Mn	595	570	9	190
25Mn	600	520	15	195
27SiMn	840	805	7.5	230

Inner diameter mm	Outer diameter mm	Wall thickness mm	Unit weight kg/m
40	45	2.5	2.6201
50	57	3.5	4.6176
63	69	3	4.8827
80	86	3	6.1403
80	88	4	8.2858
90	100	5	11.7135
100	108	4	10.2586
100	110	5	12.9465
125	133	4	12.7246
125	135	5	16.0290
140	152	6	21.6022
150	160	5	19.1115
160	170	5	20.3445
160	172	6	24.5614
180	194	7	32.2799
200	214	7	35.7323
200	216	8	41.0342
200	219	9.5	49.0796
250	266	8	50.8982
250	273	11.5	74.1588
300	320	10	76.4460
320	340	10	81.3780
400	426	13	132.3995

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+86 13771119215