STEEL GRADES BROCHURE

POSCO SPECIALTY STEEL Co.,Ltd.

www.poscoss.com

Specialty SteelBars Wire Rods

[Carbon & Alloy Steel]

Head Office : 147 Jeokhyeon-ro, Seongsan-gu, Changwon, Gyeongsangnam-do, KoreaSeoul Office : POSCO SS&CC Tower, 479 Gangnamdae-ro, Seocho-gu, Seoul, Korea TEL : 82-2-3469-6827/ FAX: 82-2-3469-6676~7China Office : 2804(B), Dawning Center B, 500 Hongbaoshi RD, Changning Qu, Shanghai, China 201103 TEL : 86-21-6091-3688(101) / Fax 86-21-6091-2645Thailand Office : 399 Interchange 21 Building 22nd Floor, 12R Sukhumvit RD, Klongtoey-Nua,Wattana,Bangkok,Thailand 10110 TEL : 66-2-259-0371 / Fax 66-2-259-0372Japan Office : Posco Osaka Bldg 9F, 3-7 2Chome Namba, Chuo-ku, Osaka, Japan 5420076 TEL: 81-6-6214-0750 / Fax 81-6-6214-0751

Manufacturing Process

Major Facilities

Production Range

Major Applications

Steel Grades

Certificates of Approval

Packing

Reference

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The global leader of specialty steel barsand wire rods!POSCO Specialty Steel advances once again.

Investment to produce the world best steel barsNo 3. Steelmaking plant : Top-of-the-line 60-ton EAF, the worlds largestvertical type continuous bloom casterRevamping Rolling Line : Slab & Bloom Mill (SBM), Walking Beam & Batchtype heating furnaceEstablishment of the latest inspection equipment: Eddy Current Tester(ECT), Magnetic Particle Inspector (MPI), Non Destructive Tester(NDT = UT + MLFT + Identifying)

Enhancement of competitiveness through R&D network amongPOSCO family companies

Continuation of R&D cooperation system among family companies such asPOSCO Technical Research Laboratories, POSTECH and RIST

Customer value enhancement through before and after serviceCustomer needs discovery through regular technical services andcustomer satisfaction researchAfter-service care through prompted customer service system

POSCO SPECIALTY STEEL WWW.POSCOSS.COM04 . 05Manufacturing Process Major Facilities Production Range Major Applications Steel Grades Certificates of Approval Packing Reference

EAF Bloom Caster ESR (Electro Slag Refining) Precision Rolling Mill for Medium /Large size Bars

Rolling Mill for Medium /Small size Wire Rods and Bars

9,000-ton Forging press

Characteristics of vertical type large-section continuous bloom caster

Securing homogenous quality by enhancing the reduction ratio : Bloom size (420 530mm)The latest equipments to improve the surface, internal quality and cleanliness

- Slag Detector- Continuous temperature measure system, ECLM(Eddy Current Level Measurement)- M-EMS, F-EMS, Soft Reduction RollProduce homogenous high alloy steel by vertical type caster

The best Quality Guarantee System

Improvement of the surface quality of wire rods and small bars through ECTImprovement of quality reliability of bars through the latest NDT and installing more MPIs

Manufacturing ProcessEstablishment the foundation for high alloy specialtysteel production through investment in top-of-the-line60-ton EAF and the worlds largest vertical typecontinuous bloom caster.

Major Facilities

EAF [2, EBT type] : 100-ton, 60-ton

VIM [1] : 1-ton

Ladle Furnace [LF] : 100-ton, 60-ton

Vacuum Degassing [VD/VOD] : 100-ton, 60 ton

Stainless steel Refining [AOD] : 100-ton

ESR : 30-ton, 5-ton

Billet Caster [Curved type] - 150, 160sq. 150, 200 6 Strands

Bloom Caster [Vertical type] - 420 530mm 2 Strands

Ingot Casting Facility [bottom casting, Vacuum ingot casting] : 4~150-ton

Rolling Mill for Wire Rod and Small Round Bar -13~85mm

Rough Mill (H-V type), Kocks Mill(3Roll)

Precision Rolling Mill - R.S.M (Wire rod), P.S.B (Round bar)

Precision Steel Rolling Mill for Medium/Large bar -90~350mm

S.B.M (2-stage reverse type), Bloomer Mill (2-stage reverse type),

H-V mill (2Roll) - C.C.R (Round Bar), F.B.M (Flat Bar)

Forging Press [2]: 9,000-ton/1,800-ton

Heat Treatment Furnace [20] - continuous, batch furnace type

Straightening [15]: 2Roll, Multi Roll, Bump type

Machining [13]: CD, CG, Peeling(Smooth turning , Rough turning)

Inspection [10]: ECT, NDT, TOM, UT, MPI

Steelmaking

Rolling

Forging

Finishing

Melting

Refining

Casting

Process Facilities

Production RangeMajor Facilities

From state-of-the-art facilities to environment-friendly manufacturing process -Endless efforts to improve the global competitiveness. Production Range

Round Bar

Size

Black surface (As Rolled) : 13.0 ~ 350mmPolishing (Grinding) : 6.0 ~ 80mmDrawing : 6.2 ~ 30mmSmooth turning : 8.0 ~ 80mmRough turning : 80.0 ~ 320mm

[ Rolled ]

Black surface (As Forged) : 220 ~ 1,300mmRough Machining(turning) : 206 ~ 1,300mm

[ Forged ]

Length Rolled: 2,000 ~ 12,000mm Forged: 2,000 ~ 15,000mm

Square Bar

Size 70 ~ 350SQ

Length Max 12,000mm

Flat Bar

Size Rolled 10 ~ 200T 150 ~ 1,050WForged 150 ~ 1,100T 200 ~ 2,000W

Length 3,000 ~ 6,000mm

Wire Rod

Size 5.5 ~ 34

OuterDimension

Diamete r: Max 1,350mm (Counterclockwise)Height : Max 1,500mm


Major ApplicationsProviding the best products matched to customerneeds through continuous product developmentactivities and strict quality control system.

Automobile : Materials for functional parts including transmission, engine, and various chassis parts

Vessel (Ship parts) : Engine Bolts , materials for valves and pipes

Heavy equipment : Track link, pin, and bushing materials

Transmission parts Chassis parts

Stud bolt Cam shaft

Bolt/nut assembly Piston pin

Plant Industry : Materials for parts of generators, heat exchangers and turbines

Machine Industry : Bolt, nut, shaft, LM guide, and bearing materials

Defense Industry : High-performance materials such as gun barrel and airframe

Torsion barAirframe material

Gun barrel material

Guide components

BearingBolts and nuts

Generation facility hanger, valve Turbine blade pin

Track chain

For TBM cutter Tunnel boring machine (TBM)

Pin, bushingLink


Steel Grade Structural steel /Mn steel

Steel GradeChemical Composition (wt%)

C Si Mn P S Ni Cr Mo Cu Etc.KS/JIS SAE/AISI ASTMDIN

Others

Standards

S10C

S15C

S20C

S25C

S30C

S35C

S40C

S45C

S50C

S53C

S55C

S58C

XC43

XC55

S45CR

S55CR

S45CS

S53CM

S55CM

S58CM

SAE1006

SAE1045M

SAE1050M

LF2

A105

SMn420

SMn433

SMn438

SMn443

SAE1541M

SAE1552M

AISI1340

S34MnV

S45Mn5

SM10C 1010 Ck10 0.08~0.13 0.15~0.35 0.30~0.60 ~0.030 ~0.035

SM15C 1015 Ck15 0.13~0.18 0.15~0.35 0.30~0.60 ~0.030 ~0.035

SM20C 1020 Ck20 0.18~0.23 0.15~0.35 0.30~0.60 ~0.030 ~0.035

SM25C 1025 Ck25 0.22~0.28 0.15~0.35 0.30~0.60 ~0.030 ~0.035

SM30C 1030 Ck30 0.27~0.33 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM35C 1035 Ck35 0.32~0.38 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM40C 1040 Ck40 0.37~0.43 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM45C 1045 Ck45 0.42~0.48 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM50C 1050 Ck50 0.47~0.53 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM53C 1053 CK53 0.50~0.56 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM55C 1055 CK55 0.52~0.58 0.15~0.35 0.60~0.90 ~0.030 ~0.035

SM58C 1058 CK58 0.55~0.61 0.15~0.35 0.60~0.90 ~0.030 ~0.030

0.40~0.46 0.15~0.35 0.60~0.90 ~0.030 ~0.035 0.20~0.40

S53CCF 0.52~0.56 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.10~0.20

0.42~0.48 0.15~0.35 0.60~0.90 ~0.030 ~0.035 0.10~0.20

0.55~0.58 0.15~0.35 0.60~0.90 ~0.030 ~0.035 0.10~0.20

S45CHS 0.44~0.47 0.20~0.30 0.65~0.85 ~0.030 0.020~0.040 ~0.20

0.50~0.56 0.15~0.35 0.60~0.90 ~0.030 0.025~0.045

0.55~0.58 0.15~0.35 0.60~0.90 ~0.025 ~0.025 0.10~0.20

0.55~0.60 0.15~0.35 0.60~0.90 ~0.025 ~0.025 0.10~0.40

SWRCH6A 1006 ~0.08 0.25~0.40 ~0.030 ~0.050

S45C 1045 0.46~0.50 0.20~0.30 0.80~1.10 ~0.025 0.015~0.030

S50C 1050 0.48~0.55 0.15~0.30 0.90~1.10 ~0.030 0.025~0.040

A266 Grade2 SF490V ~0.30 0.15~0.30 0.60~1.35 ~0.035 ~0.040

SM490YB SA105 ~0.35 ~0.35 0.60~1.05 ~0.040 ~0.050

SMN420 1520 LT40 20Mn2 0.17~0.23 0.15~0.35 1.20~1.50 ~0.030 ~0.030

SMN433 1536 28Mn6 0.30~0.36 0.15~0.35 1.20~1.50 ~0.030 ~0.030

SNM438 1541 35Mn2 0.35~0.41 0.15~0.35 1.35~1.65 ~0.030 ~0.030

SMN443 1547 40Mn2 0.40~0.46 0.15~0.35 1.35~1.65 ~0.030 ~0.030

0.40~0.45 0.15~0.35 1.40~1.65 ~0.035 ~0.050

0.51~0.54 0.15~0.35 1.40~1.65 ~0.035 0.010~0.030

1340 0.38~0.43 0.15~0.35 1.60~1.90 ~0.030 ~0.040

SMN430V A572 32MnV ~0.37 ~0.35 ~1.40 ~0.020 ~0.020 V added

0.42~0.50 ~0.40 ~1.40 ~0.035 0.025~0.045 Al added

Structural

steel

Mn steel




Others

Standards

SCr415SCr420SCr430SCr435SCr440SCr420H1SCr420H1VSCr420H3VS2SCr420H9VS2SCr420HB16MnCrS5SCM415SCM418SCM420SCM435SCM440SCM445SCM420VSCM445VSCM722HSCM822HSCMH1SCMH1MSACM645SCM920HVSIB5B16F11F12F22F2321CrMoV51131CrMoV931CrMo1258CrMoV4ASCM17H1

SCr415H 5115(H) 15Cr 0.12~0.18 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20SCr420H 5120(H) 20Cr 0.18~0.23 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20SCr430H 5130(H) 30Cr 0.28~0.33 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20SCr435H 5135(H) 35Cr 0.32~0.39 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20SCr440H 5140(H) 42Cr 0.38~0.43 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20

SCr420H2 0.17~0.23 0.15~0.35 0.55~0.90 ~0.025 ~0.025 0.85~1.25SCr420H2V 0.17~0.23 0.15~0.35 0.55~0.90 ~0.030 ~0.030 0.85~1.25

SCr420H2VS2 0.17~0.23 0.15~0.35 0.55~0.90 ~0.030 0.020~0.030 ~0.25 0.85~1.25 ~0.30SCr420H8VS2 0.17~0.23 0.15~0.35 0.55~0.90 ~0.030 0.020~0.030 ~0.25 0.85~1.25 ~0.30SAE5120HB 0.17~0.23 0.15~0.35 0.55~0.90 ~0.020 ~0.020 0.85~1.25 0.05~0.10 B, Nb added

41CrS4 0.14~0.19 ~0.40 1.00~1.30 ~0.035 0.020~0.035 0.80~1.10SCM415H 4115(H) 16CrMo4 0.13~0.18 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.15~0.25SCM418H 4118(H) 18CrMo4 0.16~0.21 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.15~0.25SCM420H 4120(H) 20CrMo4 0.18~0.23 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.15~0.25SCM435H 4135(H) 34CrMo4 0.33~0.33 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.15~0.30SCM440H 4140(H) A193 B7 42CrMo4 0.38~0.43 0.15~0.35 0.60~0.85 ~0.030 ~0.030 0.90~1.20 0.15~0.30SCM445H 4145(H) 50CrMo4 0.43~0.48 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.15~0.30

12CrMoV 0.17~0.22 0.20~0.35 0.50~0.85 ~0.030 ~0.035 0.90~1.20 0.15~0.25 V addedA193 B16 0.43~0.48 0.20~0.35 0.50~0.85 ~0.030 ~0.030 0.90~1.20 0.15~0.30 V added

0.19~0.25 0.15~0.35 0.55~0.90 ~0.030 ~0.030 0.95~1.25 0.20~0.400.20~0.25 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.90~1.20 0.35~0.45

4120H 0.20~0.25 0.15~0.35 0.60~1.00 ~0.030 ~0.030 0.90~1.30 0.20~0.404120H 0.20~0.25 0.15~0.35 0.70~1.10 ~0.030 ~0.030 0.95~1.35 0.08~0.15

SACM1 41CrAlMo7-10 0.40~0.50 0.15~0.50 ~0.60 ~0.030 ~0.030 ~0.25 1.30~1.70 0.15~0.30 ~0.30 Al added0.17~0.21 ~0.15 0.60~0.85 ~0.020 ~0.030 1.25~1.45 0.55~0.65 Nb added

STPA25 F5/ T5 8CrMo16-5 0.10~0.15 ~1.00 ~1.00 ~0.040 ~0.030 4.00~6.00 0.40~0.65SNB16 B21 40CrMoV4 0.36~0.47 0.15~0.35 0.45~0.70 ~0.035 ~0.040 0.80~1.15 0.50~0.65 V added

A739 B11 0.05~0.15 0.50~1.00 0.30~0.60 ~0.030 ~0.030 1.00~1.50 0.44~0.6515CrMoV5-9 0.10~0.15 ~0.50 0.30~0.60 ~0.030 ~0.030 0.80~1.25 0.44~0.65

STPA24 B22 31CrMo12 ~0.15 ~0.50 0.30~0.60 ~0.040 ~0.040 2.00~2.50 0.87~1.130.04~0.10 ~0.50 0.10~0.60 ~0.030 ~0.010 1.90~2.60 0.05~1.30 W, V, Nb added

B50A164B 0.17~0.25 0.30~0.60 0.30~0.60 ~0.035 ~0.035 ~0.60 1.20~1.50 1.00~1.20 V addedWNr 1.8519 0.27~0.34 ~0.40 0.40~0.70 ~0.025 ~0.035 2.30~2.70 0.15~0.25 V addedWNr 1.8515 0.28~0.35 ~0.40 0.40~0.70 ~0.020 ~0.030 2.80~3.30 0.30~0.50EN 17792 0.55~0.62 0.15~0.40 0.70~1.10 ~0.035 ~0.040 0.90~1.20 0.15~0.25 V added

SCM420H 4118(H) 18CrMo4 0.15~0.21 0.15~0.35 0.55~0.90 ~0.030 0.015~0.025 0.85~1.25 0.15~0.35

Cr steel

Cr-Mo

steel

Steel Grade Cr steel / Cr-Mo steel




Others

Standards

SAE4015SAE4025SAE404520MnMo4SNC415SNC631SNC236SNC815SNC836AISI4620AISI4815AISI4820LF3SNCM220SNCM240SNCM415SNCM420SNCM431SNCM439SNCM447SNCM616SNCM815SNCM625SNCM630SNCM630MSAE8625HSAE8630HSAE8650HSAE8660HSAE8720H18CrNiMo730CrNiMo834CrNiMo642CrNiMo6SKC24MD-300M

4015 16Mo3 0.12~0.20 0.10~0.35 0.40~0.80 ~0.035 ~0.035 0.25~0.354025 F1 Class 0.20~0.30 0.15~0.35 0.60~0.80 ~0.025 ~0.025 0.40~0.604045 A194 Grade4 0.40~0.50 0.15~0.35 0.70~0.90 ~0.035 ~0.040 0.20~0.304023 0.17~0.23 0.15~0.35 1.10~1.40 ~0.025 ~0.015 0.20~0.35

SNC21 14NiCr10 0.12~0.18 0.15~0.35 0.35~0.65 ~0.030 ~0.030 2.00~2.50 0.20~0.50SNC2 36NiCr10 0.27~0.35 0.15~0.35 0.35~0.65 ~0.030 ~0.030 2.50~3.00 0.60~1.00SNC1 3135 36NiCr6 0.32~0.40 0.15~0.35 0.50~0.80 ~0.030 ~0.030 1.00~1.50 0.40~0.90

15NiCr13 0.12~0.18 0.15~0.35 0.35~0.65 ~0.030 ~0.030 3.00~3.50 0.70~1.00SNC3 31NiCr14 0.32~0.40 0.15~0.35 0.35~0.65 ~0.030 ~0.030 3.00~3.50 0.60~1.00

4620H A580 Grade3 15NiC6 0.17~0.23 0.15~0.35 0.35~0.75 ~0.035 ~0.040 1.55~2.00 0.20~0.304815H 0.12~0.18 0.15~0.35 0.30~0.70 ~0.025 ~0.025 3.20~3.80 0.20~0.304820H 30NiMoCr10 0.17~0.23 0.15~0.35 0.40~0.80 ~0.035 ~0.040 3.20~3.80 0.20~0.302315 ~0.20 0.20~0.35 ~0.90 ~0.035 ~0.040 3.20~3.70 ~0.12

SNCM21 8620H 20NiCrMo2 0.17~0.23 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.40~0.70 0.40~0.60 0.15~0.25 ~0.30SNCM6 8640H 0.38~0.43 0.15~0.35 0.70~1.00 ~0.030 ~0.030 0.40~0.70 0.40~0.60 0.15~0.25 ~0.30

SNCM22 4315H 0.12~0.18 0.15~0.35 0.40~0.70 ~0.030 ~0.030 1.60~2.00 0.40~0.60 0.15~0.30 ~0.30SNCM23 4320H 20NiCrMo7 0.17~0.23 0.15~0.35 0.40~0.70 ~0.030 ~0.030 1.60~2.00 0.40~0.60 0.15~0.30 ~0.30SNCM1 0.37~0.35 0.15~0.35 0.60~0.90 ~0.030 ~0.030 1.60~2.00 0.60~1.00 0.15~0.30 ~0.30SNCM8 4340H A540 B23,24 34NiCrMo6 0.36~0.43 0.15~0.35 0.60~0.90 ~0.030 ~0.030 1.60~2.00 0.60~1.00 0.15~0.30 ~0.30SNCM9 4345 A194 Grade7 45NiCrMo6 0.44~0.50 0.15~0.35 0.60~0.90 ~0.030 ~0.030 1.60~2.00 0.60~1.00 0.15~0.30 ~0.30

9310H 0.13~0.20 0.15~0.35 0.80~1.20 ~0.030 ~0.030 2.80~3.20 1.40~1.80 0.40~0.60 ~0.309315H 0.12~0.18 0.15~0.35 0.30~0.60 ~0.030 ~0.030 4.00~4.50 0.70~1.00 0.15~0.30 ~0.30

SNCM625 9325 0.20~0.30 0.15~0.35 0.35~0.60 ~0.030 ~0.030 3.00~3.50 1.00~1.50 0.15~0.30 ~0.30SNCM5 9330 30NiMoCr10 0.25~0.35 0.15~0.35 0.35~0.60 ~0.030 ~0.030 3.00~3.50 1.00~1.50 0.15~0.30 ~0.30

0.24~0.29 0.32~0.45 0.35~0.55 ~0.030 ~0.030 3.70~3.95 1.55~1.80 0.40~0.50 ~0.30 Al added21NiCrMo2-2 0.22~0.28 0.15~0.35 0.60~0.95 ~0.035 ~0.040 0.35~0.75 0.35~0.65 0.15~0.25 ~0.3030NiCrMo2-2 0.27~0.33 0.15~0.35 0.60~0.95 ~0.035 ~0.040 0.35~0.75 0.35~0.65 0.15~0.25 ~0.30

SNCM7 48NiCrMo2-2 0.47~0.54 0.15~0.35 0.70~1.05 ~0.035 ~0.040 0.35~0.75 0.35~0.65 0.15~0.25 ~0.3560NiCrMo2 0.55~0.65 0.15~0.35 0.70~1.05 ~0.035 ~0.040 0.35~0.75 0.35~0.65 0.15~0.25 ~0.35

21NiCrMo2-2 0.17~0.23 0.15~0.35 0.60~0.95 ~0.030 ~0.040 0.35~0.75 0.35~0.65 0.20~0.30 ~0.35WNr1.6587 0.15~0.22 ~0.40 0.40~0.60 ~0.035 ~0.035 1.40~1.70 1.50~1.80 0.25~0.35WNr1.6580 0.26~0.34 ~0.40 0.40~0.60 ~0.035 ~0.035 1.80~2.20 1.80~2.20 0.30~0.50WNr1.6582 0.30~0.38 ~0.40 0.50~0.80 ~0.035 ~0.035 1.30~1.70 1.30~1.70 0.15~0.30

0.38~0.45 ~0.40 0.50~0.90 ~0.035 ~0.025 0.80~1.00 0.90~1.20 0.15~0.3040NiMoCr10-5 0.37~0.43 0.15~0.35 0.50~0.70 ~0.035 ~0.035 2.40~2.70 0.60~0.80 0.40~0.6038NiCrMoV7-3 0.40~0.45 1.45~1.80 0.65~0.90 ~0.010 ~0.010 1.65~2.00 0.70~0.95 0.35~0.45 V added

Mo steel

Ni-Cr,

Ni-Mo

steel

Ni-Cr-Mo

steel

Steel Grade Mo steel / Ni-Cr, Ni-Mo steel/ Ni-Cr-Mo steel




Others

Standards

AISI10B21

AISI10B22

AISI10B30

AISI10B35

AISI10B38

15B23M

15B36M

15B24CR

15B36CR

41B30M

S43BC

SCR420B

SCR440B

SCM440B

SUP6

SUP7

SUP9

SUP9D

SUP9A

SUP11A

SAE9254

50CrMoV

SUJ2

SUJ5

SUM21

SUM22

SUM23

SUM31

SUM32

SUM41

SUM42

SUM43

AISI1140

AISI1151

0.18~0.23 0.60~0.90 ~0.040 ~0.050 B : 5~30ppm

10B22 PC22B 0.18~0.23 0.15~0.35 0.70~1.00 ~0.040 ~0.050 B : 5~30ppm

10B30 PC30B 0.28~0.34 0.60~0.90 ~0.030 ~0.050 B : 5~30ppm

10B35 PC35B 0.32~0.38 0.60~0.90 ~0.030 ~0.050 B : 5~30ppm

0.35~0.42 0.60~0.90 ~0.030 ~0.050 B : 5~30ppm

15B21H 20MnCrB3 0.20~0.60 0.15~0.30 0.80~1.10 ~0.030 ~0.030 0.10~0.20 B : 5~40ppm

15B35H 39MnCrB6-2 0.32~0.36 0.20~0.30 1.20~1.45 ~0.025 0.010~0.025 0.20~0.30 B : 5~40ppm

0.23~0.26 0.20~0.35 0.85~1.15 ~0.030 ~0.030 0.15~0.30 B : 10~30ppm

0.32~0.36 0.20~0.30 1.20~1.50 ~0.025 ~0.025 0.20~0.35 B : 5~30ppm

40CrMoB3 0.31~0.36 0.15~0.35 1.00~1.30 ~0.030 ~0.030 0.40~0.65 0.13~0.20 B : 5~30ppm

0.48~0.48 0.15~0.35 0.60~0.90 ~0.030 ~0.035 ~0.20 B : 5~40ppm

51B20 20MnCrB5 0.18~0.23 0.15~0.35 0.60~0.85 ~0.025 ~0.025 0.90~1.20 B : 8~30ppm

0.38~0.43 0.15~0.35 0.60~0.85 ~0.030 ~0.030 0.90~1.20 B : 5~30ppm

0.38~0.43 0.15~0.35 0.60~0.85 ~0.030 ~0.030 0.90~1.20 0.15~0.30 B : 5~30ppm

SPS3 250A53 0.56~0.64 1.50~1.80 0.70~1.00 ~0.035 ~0.035 ~0.30

SPS4 9260 60SiCr7 0.56~0.64 1.80~2.20 0.70~1.00 ~0.035 ~0.035 ~0.25

SPS5 5155 55Cr3 0.52~0.60 0.15~0.35 0.65~0.95 ~0.035 ~0.035 0.65~0.95 ~0.25

0.56~0.60 0.20~0.30 0.80~0.95 ~0.025 ~0.010 ~0.15 0.80~0.90 ~0.06 ~0.20 Al added

5160H 0.56~0.64 0.15~0.35 0.70~1.00 ~0.035 ~0.035 0.70~1.00 ~0.30

52MnCrB3 0.56~0.64 0.15~0.35 0.70~1.00 ~0.035 ~0.035 0.70~1.00 ~0.30 B added

54SiCr6 0.51~0.59 1.20~1.60 0.60~0.80 ~0.035 ~0.040 ~0.25 0.60~0.80 ~0.35

SAE9250V 0.47~0.55 0.15~0.40 0.70~1.10 ~0.030 ~0.030 0.90~1.20 ~0.25 V added

STB2 52100 100CR6 0.95~1.10 0.15~0.35 ~0.50 ~0.025 ~0.025 1.30~1.60

STB5 0.95~1.10 0.40~0.70 0.90~1.15 ~0.025 ~0.025 0.90~1.20 0.10~0.25

1212 10S20 ~0.13 0.70~1.00 0.07~0.12 0.16~0.24

1213 11SMn30 ~0.13 0.70~1.00 0.07~0.12 0.24~0.33

1215 11SMn37 ~0.09 0.75~1.05 0.04~0.90 0.26~0.35

1117 0.14~0.20 1.00~1.30 ~0.040 0.08~0.13

1118 15S22 0.12~0.20 0.60~1.10 ~0.040 0.10~0.20

1137 35S20 0.32~0.39 1.35~1.65 ~0.040 0.08~0.13

1141 0.37~0.45 1.35~1.65 ~0.040 0.08~0.13

1144 44SMn28 0.40~0.48 1.35~1.65 ~0.040 0.24~0.33

0.37~0.44 0.70~1.00 ~0.040 0.08~0.13

46S20 0.48~0.55 0.70~1.00 ~0.040 0.08~0.13

Boron

added

Steel

Spring

Steel

BearingSteel

Free

Cutting

Steel

The material produced by POSCO's blast furnace can be applicable.

Steel Grade Boron added Steel / Spring Steel / Bearing Steel / Free Cutting Steel




Others

Standards

PC30SI

PC32SI

PC32B

PC32SiB

PC35SiB

PSA1540M

PSA1540VS1

PSA1554

PSA12Cr1V

PSA51B32M

PSA5135H1

PSA4119

PSA4136

PSA3115MS

PSA3333

PSA3310

PSA4120H1

PSA41B20

PSA41B20NI

PSA4316M

PSA4356V

PSTBM

PSTBM2

PSA6145

JSP

PFS-100

SCMH1

SCMH1M

SCMH2

QS1136

220Mo7

0.28~0.32 1.65~1.85 0.65~0.85 ~0.030 ~0.015 Al added

0.30~0.34 1.65~1.85 0.65~0.85 ~0.030 ~0.015 Al added

0.30~0.34 0.20~0.30 0.65~0.85 ~0.030 ~0.015 B, Ti added

0.29~0.34 1.00~1.50 0.65~0.90 ~0.030 ~0.015 B, Ti added

0.32~0.38 1.10~1.50 0.60~0.90 ~0.030 ~0.015 B, Ti added

SMN420M 40Mn16 0.38~0.42 1.90~2.10 4.80~5.20 ~0.030 ~0.030 Al added

S40CVT 38MNSIVS5 0.38~0.42 0.15~0.35 0.70~0.90 ~0.030 0.02~0.04 V added

SMN440M 55Mn4 0.52~0.57 0.15~0.35 1.10~1.40 ~0.035 ~0.035

SCR415M 5115MV,12CRV4 0.08~0.15 0.15~0.35 0.60~0.90 ~0.030 ~0.030 0.80~1.20 V added

51B35M 0.30~0.35 0.15~0.35 0.60~0.90 0.80~1.20 B, Nb added

51B35M 0.32~0.37 0.15~0.35 0.60~0.90 ~0.030 0.015~0.030 0.90~1.25

SCM420H 4120H SAE4119H 0.18~0.23 0.15~0.35 0.60~0.80 ~0.035 0.010~0.040 0.50~0.70 0.30~0.40

SCM435H 4135H SAE4136H 0.33~0.40 0.15~0.35 0.60~0.80 ~0.035 ~0.040 0.70~0.90 0.30~0.40

3115H 0.12~0.18 0.15~0.35 1.20~1.50 ~0.040 0.15~0.30 2.00~2.50 0.20~0.50

33NICR12 0.30~0.35 0.25~0.35 0.40~0.60 4.00~4.40 1.10~1.30

3310 0.08~0.13 0.20~0.35 0.40~0.60 3.20~3.70 1.40~1.70

0.16~0.24 0.15~0.35 0.50~0.90 ~0.030 0.015~0.030 0.85~1.25 0.15~0.35

SCM420B 0.14~0.20 0.20~0.40 0.70~0.90 ~0.025 ~0.025 1.50~1.80 0.40~0.50 0.25~0.35 B added

SAE8620B 0.14~0.20 0.20~0.40 1.40~1.60 ~0.025 ~0.025 0.40~0.65 1.50~1.80 0.40~0.50 0.25~0.35 B added

SAE4316M 0.12~0.20 ~0.35 0.80~1.20 ~0.030 ~0.020 2.80~3.20 1.40~1.80 0.40~0.60 V added

SAE4356V 0.54~0.58 1.00~1.15 0.80~0.95 ~0.030 ~0.020 2.30~2.60 0.45~0.65 0.32~0.58 V added

55CrMoNiV8-8 0.48~0.55 0.25~0.40 0.70~0.90 1.00~1.50 2.00~3.00 0.30~0.50 V added

48CrMoNiV20 0.45~0.50 0.80~0.90 0.70~0.90 ~0.030 ~0.030 0.30~0.45 5.00~5.50 0.80~1.00 V added

0.40~0.50 0.15~0.50 ~0.60 ~0.030 0.01~0.03 1.30~1.70 0.15~0.30 Al:1.00~1.20

AISI9332V 0.32~0.36 0.10~0.30 0.50~0.80 2.20~2.60 0.80~1.10 0.45~0.60 V added

15NiCuMoNb5 ~0.06 ~0.40 0.40~0.70 3.30~3.60 0.45~0.75 0.40~0.60 Cu, Nb added

4120H 0.20~0.25 0.15~0.35 0.60~1.00 ~0.030 ~0.030 0.90~1.30 0.20~0.40

5120H 0.20~0.25 0.15~0.35 0.70~1.10 ~0.030 ~0.030 0.95~1.35 0.08~0.15

SNCM420 4320H 0.17~0.23 0.15~0.35 0.75~1.00 ~0.030 ~0.030 0.40~0.80 0.85~1.20 0.25~0.45

SUM32M 0.37~0.41 0.15~0.35 0.80~1.00 ~0.350 0.07~0.12 0.15~0.35

~0.15 0.90~1.30 ~0.070 0.2~0.3

POSCO SS

Spec.

High tensile

strength

steel

Steel Grade High tensile strength steel / POSCO SS Spec.


Non-destructive tester for Medium size bar / T.O.M

Non-destructive tester for Small size bar / N.D.T

Non-destructive tester for Small size peelede bar / E.C.T&U.T

Non-destructive tester for Medium/large size peeled bar / N.D.T

Eddy Current Tester for wire rod /E.C.T Portable UT tester for large size bar

Chemical analyzer Gas analyzer Tensile tester

Creep tester Impact tester Electronic microscope (SEM/EDS)

Test analysis to develop new products performed through the utilization of various equipments among thefamily companies such as POSCO Technical Research Laboratories and RIST.

KOREA Occupational Health and Safety Management System

Quality Testing

Test Analysis

Quality AssuranceThe best inspection system incorporating the latest facilitiesand analysis equipments to ensure the highest productquality for customer use and processing conditions.

Certificates of ApprovalOur quality control ability is globallyrecognized through acquiring variouscertificates such as ISO 9001, ISO/TS16949, and ASME.


Label and Tag

Packing

Round Bar

Square Bar Flat Bar Wire Rod

Bare Hessian

Bare Bare Bare

Wooden Slate Wooden Box

Label Tag

Tolerance and Deviation

Size Tolerance for peeled product (ISO, ASTM)

Apply the + of h class tolerance to K class (the absolute value is the same as h class / the same as DIN671 h9 class)

Length Tolerance - Fixed length (except random length): +40, -0 (JIS standard) Others: separate discussion needed within our facility specification

+0-0.022+0-0.027+0-0.033+0-0.039+0-0.046+0-0.054

13 35 : 0.20mm35 50 : 0.25mm50 80 : 0.30mm80 350 : 1.5% of Dia.H9 or K9 levelH9 or K9 level, ASTM A484H11 or K11 level, ASTM A484+6.0%, -0 of nominal diameter300 400 : +18, -0400 600 : +20, -0600 800 : +25, -0800 1000 : +30, -01000 : +50, -0

220 : +0.6% of Dia,-0220 980 : +1.0% of Dia, -0980 1300 : +1.6% of Dia, -0

~ 5.5 : 0.155.5 ~ 13.0 : 0.2013.0 ~ 24 : 0.20

2.0% of Dia.(non-polished)3.0% of Dia.(polished)

Within 70% of size tolerance







+0-0.036+0-0.043+0-0.052+0-0.062+0-0.074+0-0.087

+0-0.058+0-0.070+0-0.084+0-0.100+0-0.120+0-0.140

+0-0.090+0-0.110+0-0.130+0-0.160+0-0.190+0-0.220

+0-0.150+0-0.180+0-0.210+0-0.250+0-0.300+0-0.350

0.030

0.040

0.050

0.060

0.080

DiameterTolerance

h8 h9 h10 h11 h12ASTM A484

(REV:96)I S O

68

1013

1825.4

3038.1

50

80101.6

120

Classification Surface DeviationTolerance

Roun

d ba

r

Rolled

Forged

Wire rod

Rolled billet

Blacksurface

Peeled

BS

CGCDSTRT

BS

RT

Packing Various packing methods are utilized for protection of products throughout all processes from handling to shipping and delivery. ReferenceA company that can make customers satisfaction, a company thatcan make the best quality product-We will become a truly valuable company with the customers.


STEEL GRADES BROCHURE

Documents

vertical type caster

bloom size

posco specialty steel

slab bloom

surface quality of wire

ebt type

japan office

thailand office