方形冷弯空心型钢(GB/T6728—2017)

边长

允许偏差

壁厚

理论质量

截面面积

惯性矩

惯性半径

截面系数

扭转常数

B/mm

/mm

t/mm

M/kg·m^-1

A/cm²

I_X＝I_Y/cm⁴

R_X＝R_Y/cm

W_X＝W_Y/cm³

I_t/cm⁴

C_t/cm³

20

±0.50

1.2

1.5

1.75

2.0

0.679

0.826

0.941

1.050

0.865

1.052

1.199

1.340

0.498

0.583

0.642

0.692

0.759

0.744

0.732

0.720

0.498

0.583

0.642

0.692

0.823

0.985

1.106

1.215

0.75

0.88

0.98

1.06

25

±0.50

1.2

1.5

1.75

2.0

0.867

1.061

1.215

1.363

1.105

1.352

1.548

1.736

1.025

1.216

1.357

1.482

0.963

0.948

0.936

0.923

0.820

0.973

1.086

1.186

1.655

1.998

2.261

2.502

1.24

1.47

1.65

1.80

30

±0.50

1.5

1.75

2.0

2.5

3.0

1.296

1.490

1.677

2.032

2.361

1.652

1.898

2.136

2.589

3.008

2.195

2.470

2.721

3.154

3.500

1.152

1.140

1.128

1.103

1.078

1.463

1.646

1.814

2.102

2.333

3.555

4.048

4.511

5.347

6.060

2.21

2.49

2.75

3.20

3.58

40

±0.50

1.5

1.75

2.0

2.5

3.0

4.0

1.767

2.039

2.305

2.817

3.303

4.198

2.525

2.598

2.936

3.589

4.208

5.347

5.489

6.237

6.939

8.213

9.320

11.064

1.561

1.549

1.537

1.512

1.488

1.438

2.744

3.118

3.469

4.106

4.660

5.532

8.728

10.009

11.238

13.539

15.628

19.152

4.13

4.69

5.23

6.21

7.07

8.48

50

±0.50

1.5

1.75

2.0

2.5

3.0

4.0

2.238

2.589

2.933

3.602

4.245

5.454

2.852

3.298

3.736

4.589

5.408

6.947

11.065

12.641

14.146

16.941

19.463

23.725

1.969

1.957

1.945

1.921

1.897

1.847

4.426

5.056

5.658

6.776

7.785

9.490

17.395

20.025

22.578

27.436

31.972

40.047

6.65

7.60

8.51

10.22

11.77

14.43

60

±0.60

2.0

2.5

3.0

4.0

5.0

3.560

4.387

5.187

6.710

8.129

4.540

5.589

6.608

8.547

10.356

25.120

30.340

35.130

43.539

50.468

2.350

2.329

2.305

2.256

2.207

8.380

10.113

11.710

14.513

16.822

39.810

48.539

56.892

72.188

85.560

12.60

15.22

17.65

21.97

25.61

70

±0.65

2.5

3.0

4.0

5.0

5.170

6.129

7.966

9.699

6.590

7.808

10.147

12.356

49.400

57.522

72.108

84.602

2.740

2.714

2.665

2.616

14.100

16.434

20.602

24.172

78.500

92.188

117.975

141.183

21.20

24.74

31.11

36.65

80

±0.70

2.5

3.0

4.0

5.0

5.957

7.071

9.222

11.269

7.589

9.008

11.747

14.356

75.147

87.838

111.031

131.414

3.147

3.122

3.074

3.025

18.787

21.959

27.757

32.853

118.520

139.660

179.808

216.628

28.22

33.02

41.84

49.68

90

±0.75

3.0

4.0

5.0

6.0

8.013

10.478

12.839

15.097

10.208

13.347

16.356

19.232

127.277

161.907

192.903

220.420

3.531

3.482

3.434

3.385

28.283

35.979

42.867

48.982

201.108

260.088

314.896

365.452

42.51

54.17

64.71

74.16

100

±0.80

4.0

5.0

6.0

11.734

14.409

16.981

11.947

13.356

21.632

226.337

271.071

311.415

3.891

3.842

3.794

45.267

54.214

62.283

361.213

438.986

511.558

68.10

81.72

94.12

110

±0.90

4.0

5.0

6.0

12.990

15.980

18.866

16.548

20.356

24.033

305.940

367.950

424.570

4.300

4.252

4.203

55.625

66.900

77.194

486.47

593.60

694.85

83.63

100.74

116.47

120

±0.90

4.0

5.0

6.0

8.0

14.246

17.549

20.749

26.840

18.147

22.356

26.432

34.191

402.260

485.441

562.094

696.639

4.708

4.659

4.611

4.513

67.043

80.906

93.683

116.106

635.603

776.632

910.281

1155.010

100.75

121.75

141.22

174.58

130

±1.00

4.0

5.0

6.0

8.0

15.502

19.120

22.634

28.921

19.748

24.356

28.833

36.842

516.970

625.680

726.640

882.860

5.117

5.068

5.020

4.895

79.534

96.258

111.79

135.82

814.72

998.22

1173.6

1502.1

119.48

144.77

168.36

209.54

140

±1.10

4.0

5.0

6.0

8.0

16.758

20.689

24.517

31.864

21.347

26.356

31.232

40.591

651.598

790.523

920.359

1153.735

5.524

5.476

5.428

5.331

53.085

112.931

131.479

164.819

1022.176

1253.565

1475.020

1887.605

139.8

169.78

197.9

247.69

150

±1.20

4.0

5.0

6.0

8.0

18.014

22.260

26.402

33.945

22.948

28.356

33.633

43.242

807.82

982.12

1145.9

1411.8

5.933

5.885

5.837

5.714

107.71

130.95

152.79

188.25

1264.8

1554.1

1832.7

2364.1

161.73

196.79

229.84

289.03

160

±1.20

4.0

5.0

6.0

8.0

19.270

23.829

28.285

36.888

24.547

30.356

36.032

46.991

987.152

1202.317

1405.408

1776.496

6.341

6.293

6.245

6.148

123.394

150.289

175.676

222.062

1540.134

1893.787

2234.573

2876.940

185.25

225.79

264.18

333.56

170

±1.30

4.0

5.0

6.0

8.0

20.526

25.400

30.170

38.969

26.148

32.356

38.433

49.642

1191.3

1453.3

1701.6

2118.2

6.750

6.702

6.654

6.532

140.15

170.97

200.18

249.20

1855.8

2285.3

2701.0

3503.1

210.37

256.80

300.91

381.28

180

±1.40

4.0

5.0

6.0

8.0

21.80

27.00

32.10

41.50

27.70

34.40

40.80

52.80

1422

1737

2037

2546

7.16

7.11

7.06

6.94

158

193

226

283

2210

2724

3223

4189

237

290

340

432

190

±1.50

4.0

5.0

6.0

8.0

23.00

28.50

33.90

44.00

29.30

36.40

43.20

56.00

1680

2055

2413

3208

7.57

7.52

7.47

7.35

176

216

254

319

2607

3216

3807

4958

265

325

381

486

200

±1.60

4.0

5.0

6.0

8.0

10.0

24.30

30.10

35.80

46.50

57.00

30.90

38.40

45.60

59.20

72.60

1968

2410

2833

3566

4251

7.97

7.93

7.88

7.76

7.65

197

241

283

357

425

3049

3763

4459

5815

7072

295

362

426

544

651

220

±1.80

5.0

6.0

8.0

10.0

12.0

33.2

39.6

51.5

63.2

73.5

42.4

50.4

65.6

80.6

93.7

3238

3813

4828

5782

6487

8.74

8.70

8.58

8.47

8.32

294

347

439

526

590

5038

5976

7815

9533

11149

442

521

668

804

922

250

±2.00

5.0

6.0

8.0

10.0

12.0

38.0

45.2

59.1

72.7

84.8

48.4

57.6

75.2

92.6

108.0

4805

5672

7299

8707

9859

9.97

9.92

9.80

9.70

9.55

384

454

578

697

789

7443

8843

11598

14197

16691

577

681

878

1062

1226

280

±2.20

5.0

6.0

8.0

10.0

12.0

42.7

50.9

66.6

82.1

96.1

54.4

64.8

84.8

104.6

122.5

6810

8054

10317

12479

14232

11.2

11.1

11.0

10.9

10.8

486

575

737

891

1017

10513

12504

16436

20173

23804

730

863

1117

1356

1574

300

±2.40

6.0

8.0

10.0

12.0

54.7

71.6

88.4

104.0

69.6

91.2

113.0

132.0

9964

12801

15519

17767

12.0

11.8

11.7

11.6

664

853

1035

1184

15434

20312

24966

29514

997

1293

1572

1829

350

±2.80

6.0

8.0

10.0

12.0

64.1

84.2

104.0

123.0

81.6

107.0

133.0

156.0

16008

20618

25189

29054

14.0

13.9

13.8

13.6

915

1182

1439

1660

24683

32557

40127

47598

1372

1787

2182

2552

400

±3.20

8.0

10.0

12.0

14.0

96.7

120

141

163

123.0

153.0

180.0

208.0

31269

38216

44319

50414

15.9

15.8

15.7

15.6

1564

1911

2216

2521

48934

60431

71843

82735

2362

2892

3395

3877

450

±3.60

8.0

10.0

12.0

14.0

109

135

160

185

139

173

204

236

44966

55100

64164

73210

18.0

17.9

17.7

17.6

1999

2449

2851

3254

70043

86629

103150

119000

3016

3702

4357

4989

500

±4.00

8.0

10.0

12.0

14.0

16.0

122

151

179

207

235

155

193

228

264

299

62172

76341

89187

102010

114260

20.0

19.9

19.8

19.7

19.6

2487

3054

3568

4080

4570

96483

119470

142420

164530

186140

3750

4612

5440

6241

7013

注：1.按GB/T 6725—2002冷弯型钢用钢材的牌号和化学成分(熔炼分析)应符合GB/T 699、GB/T 700、GB/T 1591、GB/T 4171、GB/T 4239等标准的规定。根据需方要求也可提供钢材成品化学成分。

2.冷弯型钢一般不进行力学性能和工艺性能试验，按需方要求并在合同中注明，可在原料钢带上进行力学性能及工艺性能试验，并应符合相应标准的规定。

3.冷弯空心型钢用钢带冷弯后焊接而成的。焊缝处不得有开焊、搭焊、烧穿及错位等缺陷。

4.冷弯空心型钢以冷加工状态交货，通常长度为4～12m。