方形空心型钢的基本尺寸与主要参数(GB/T 6726—2008)

代号：F

B—— 边长；

t—— 壁厚

边长

B/mm

尺寸允许偏差

Δ/mm

壁厚

t/mm

理论

质量

M/(kg/m)

截面

面积

A/cm²

惯性矩

I_x＝I_y/

cm⁴

惯性半径

r_x＝r_y/

cm

截面系数

ω_x＝ω_y/

cm³

扭转常数

I_t/cm⁴

C_t/cm³

20

±0.50

1.5

0.826

1.052

0.583

0.744

0.583

0.985

0.88

1.75

0.941

1.199

0.642

0.732

0.642

1.106

0.98

2.0

1.050

1.340

0.692

0.720

0.692

1.215

1.06

25

±0.50

1.5

1.061

1.352

1.216

0.948

0.973

1.998

1.47

1.75

1.215

1.548

1.357

0.936

1.086

2.261

1.65

2.0

1.363

1.736

1.482

0.923

1.186

2.502

1.80

30

±0.50

1.5

1.296

1.652

2.195

1.152

1.463

3.555

2.21

1.75

1.490

1.898

2.470

1.140

1.646

4.048

2.49

2.0

1.677

2.136

2.721

1.128

1.814

4.511

2.75

2.5

2.032

2.589

3.154

1.103

2.102

5.347

3.20

3.0

2.361

3.008

3.500

1.078

2.333

6.060

3.58

40

±0.50

1.5

1.767

2.252

5.489

1.561

2.744

8.728

4.13

1.75

2.039

2.598

6.237

1.549

3.118

10.009

4.69

2.0

2.305

2.936

6.939

1.537

3.469

11.238

5.23

2.5

2.817

3.589

8.213

1.512

4.106

13.539

6.21

3.0

3.303

4.208

9.320

1.488

4.660

15.628

7.07

4.0

4.198

5.347

11.064

1.438

5.532

19.152

8.48

50

±0.50

1.5

2.238

2.852

11.065

1.969

4.426

17.395

6.65

1.75

2.589

3.298

12.641

1.957

5.056

20.025

7.60

2.0

2.933

3.736

14.146

1.945

5.658

22.578

8.51

2.5

3.602

4.589

16.941

1.921

6.776

27.436

10.22

3.0

4.245

5.408

19.463

1.897

7.785

31.972

11.77

4.0

5.454

6.947

23.725

1.847

9.490

40.047

14.43

60

±0.60

2.0

3.560

4.540

25.120

2.350

8.380

39.810

12.60

2.5

4.387

5.589

30.340

2.329

10.113

48.539

15.22

3.0

5.187

6.608

35.130

2.305

11.710

56.892

17.65

4.0

6.710

8.547

43.539

2.256

14.513

72.188

21.97

5.0

8.129

10.356

50.468

2.207

16.822

85.560

25.61

70

±0.65

2.5

5.170

6.590

49.400

2.740

14.100

78.500

21.20

3.0

6.129

7.808

57.522

2.714

16.434

92.188

24.74

4.0

7.966

10.147

72.108

2.665

20.602

117.975

31.11

5.0

9.699

12.356

84.602

2.616

24.172

141.183

36.65

80

±0.70

3.0

7.071

9.008

87.838

3.122

21.959

139.660

33.02

4.0

9.222

11.747

111.031

3.074

27.757

179.808

41.84

5.0

11.269

14.356

131.414

3.025

32.853

216.628

49.68

90

±0.75

3.0

8.013

10.208

127.277

3.531

28.283

201.108

42.51

4.0

10.478

13.347

161.907

3.482

35.979

260.088

54.17

5.0

12.839

16.356

192.903

3.434

42.867

314.896

64.71

6.0

15.097

19.232

220.420

3.385

48.982

365.452

74.16

100

±0.80

4.0

11.734

11.947

226.337

3.891

45.267

361.213

68.10

5.0

14.409

18.356

271.071

3.842

54.214

438.986

81.72

6.0

16.981

21.632

311.415

3.794

62.283

511.558

94.12

120

±0.90

4.0

14.246

18.147

402.260

4.708

67.043

635.603

100.75

5.0

17.549

22.356

485.441

4.659

80.906

776.632

121.75

6.0

20.749

26.432

562.094

4.611

93.683

910.281

141.22