The POSCO Quality

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C Si Mn P S Cu
POSFIS5AS 0.03 Max. 0.10 Max. 0.20 Max. 0.030 Max. 0.030 Max. -
POSFIS5M1 0.02 Max. 0.07 Max. 0.10~0.40 0.030 Max. 0.030 Max. -
POSFIS6M1 0.04 Max. 0.07 Max. 0.15~0.50 0.040 Max. 0.040 Max. -
POSFIS6B 0.05 Max. 0.07 Max. 0.60 Max. 0.040 Max. 0.040 Max. -
*POSFIS: POSCO Fine Drawing Steel

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C Si Mn P S Cu Cr
POSMICRO62 0.58~0.68 0.10~0.30 0.35~0.65 0.020 Max. 0.020 Max. 0.20 Max. 0.20 Max.
*POSMICRO: POSCO Micro

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C Si Mn P S Cu Cr
POSCABLE82 0.80~0.85 0.80~1.00 0.60~0.90 0.020 Max. 0.020 Max. 0.20 Max. -
POSCABLE86 0.82~0.89 0.80~1.00 0.60~0.90 0.020 Max. 0.020 Max. 0.20 Max. -
POSCABLE90 0.88~0.94 1.10~1.40 0.30~0.60 0.020 Max. 0.020 Max. 0.20 Max. 0.15~0.45
POSCABLE92 0.88~0.96 1.10~1.50 0.30~0.70 0.020 Max. 0.020 Max. 0.30 Max. 0.15~0.45
POSCABLE98 0.94~1.00 1.10~1.50 0.30~0.70 0.025 Max. 0.025 Max. 0.20 Max. 0.50~0.95
POSFLEX35 0.32~0.38 0.10~0.35 0.60~0.85 0.025 Max. 0.025 Max. 0.20 Max. -
POSFLEX62 0.60~0.65 0.12~0.32 0.60~0.90 0.025 Max. 0.025 Max. 0.20 Max. -
POSFLEX72 0.70~0.75 0.15~0.35 0.60~0.90 0.025 Max. 0.025 Max. 0.20 Max. -
POSNEPTUNE3 0.94~1.00 1.10~1.50 0.30~0.70 0.025 Max. 0.025 Max. 0.20 Max. 0.50~0.95
*POSCABLE: POSCO Wire Rod for Cable
*POSFLEX: POSCO Flexible Pipe
*POSNEPTUNE: POSCO Neptune Wire Rod

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C Si Mn P S Cr
POSCORD60M 0.56~0.62 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD70S 0.67~0.75 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD70M 0.67~0.75 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD70D 0.67~0.75 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD80S 0.78~0.85 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD80M 0.78~0.85 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD80D 0.78~0.85 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD86 0.83~0.89 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. -
POSCORD86CR 0.83~0.89 0.10~0.30 0.40~0.60 0.03 Max. 0.03 Max. 0.10~0.30
POSCORD92CR 0.88~0.95 0.10~0.30 0.20~0.40 0.03 Max. 0.03 Max. 0.10~0.30
POSCORD92SI 0.88~0.95 0.30~0.60 0.20~0.40 0.03 Max. 0.03 Max. 0.10~0.30
*POSCORD: POSCO Tire Cord Steel

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C Si Mn P S Cu B Ti
Class1 PSPC22 0.20~0.25 0.10~0.40 0.70~1.00 0.030 Max. 0.025 Max. - 50ppm Max. -
PSPC30B 0.27~0.32 0.15~0.35 0.60~0.90 0.030 Max. 0.035 Max. 0.25 Max. 5ppm Min. -
PSPC32B 0.29~0.34 0.15~0.35 0.60~0.90 0.030 Max. 0.035 Max. 0.25 Max. 5ppm Min. -
PSPC35B 0.32~0.38 0.15~0.35 0.60~0.90 0.030 Max. 0.035 Max. 0.25 Max. 5ppm Min. -
Class2 PSPC30SI 0.27~0.32 1.60~1.90 0.60~0.90 0.035 Max. 0.030 Max. 0.20 Max. - -
PSPC32SI 0.29~0.34 1.60~1.90 0.60~0.90 0.035 Max. 0.030 Max. 0.20 Max. - -
PSPC35SI 0.32~0.38 1.60~1.90 0.60~0.90 0.035 Max. 0.030 Max. 0.20 Max. - -
Class3 PSPC32SIB 0.29~0.36 0.50~2.00 0.55~0.95 0.030 Max. 0.025 Max. 0.25 Max. 5ppm Min. 0.01~0.06
PSPC32SIBM 0.29~0.36 0.50~2.00 0.80~1.20 0.030 Max. 0.025 Max. 0.25 Max. 5ppm Min. 0.01~0.05
PSPC35SIB 0.32~0.38 0.50~2.00 0.60~0.90 0.030 Max. 0.025 Max. 0.25 Max. 5ppm Min. 0.01~0.06
*PSPC: POSCO Super Wire Rod Prestressed Concrete

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C Si Mn P S Cu Cr Mo Ti+Zr
POSWELD1A 0.15 Max. 0.45~0.75 0.90~1.40 0.025 Max. 0.030 Max. 0.30 Max. - - -
POSWELD1B 0.15 Max. 0.40~1.00 1.00~1.60 0.030 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. 0.15 Max.
POSWELD1C 0.07 Max. 0.40~0.70 0.90~1.40 0.025 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. 0.30 Max.
POSWELD1CM 0.05~0.15 0.30~0.80 0.60~1.50 0.025 Max. 0.025 Max. 0.20 Max. 1.00~1.50 0.40~0.65 -
POSWELD2A 0.06~0.15 0.80~1.15 1.40~1.85 0.025 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. -
POSWELD2B 0.02~0.10 0.55~1.10 1.40~1.90 0.025 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. 0.30 Max.
POSWELD2J 0.10 Max. 0.55~1.10 1.25~1.60 0.030 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. -
POSWELD2S 0.08 Max. 0.55~1.10 1.25~1.90 0.030 Max. 0.01~0.03 0.30 Max. 0.30 Max. 0.30 Max. -
POSWELD4B 0.15 Max. 0.55~1.10 1.70~2.20 0.030 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. 0.30 Max.
POSWELD4D 0.15 Max. 0.50~1.10 1.60~2.10 0.025 Max. 0.025 Max. 0.30 Max. 0.30 Max. 0.40 Max. 0.30 Max.
POSWELD23 0.05~0.15 0.15~0.35 0.80~1.25 0.030 Max. 0.030 Max. 0.35 Max. 0.30 Max. 0.30 Max. -
POSWELD41 0.15 Max. 0.05 Max. 1.80~2.20 0.030 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.30 Max. -
POSWELD50 0.15 Max. 0.05 Max. 1.80~2.20 0.030 Max. 0.030 Max. 0.15 Max. 0.15 Max. 0.15 Max. -
POSWELD60 0.07~0.17 0.20 Max. 1.65~2.20 0.025 Max. 0.030 Max. 0.30 Max. 0.30 Max. 0.45~0.65 -
*POSWELD: POSCO Wire Rod for Welding

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C Si Mn P S Cr Mo others
POS55CR 0.52~0.60 0.15~0.35 0.60~0.95 0.030 Max. 0.008 Max. 0.10~0.30 0.10 Max. Cu 0.30 Max.
Ni 0.20 Max.
POSWIND100 0.93~1.05 0.50~0.70 1.00~1.20 0.025 Max. 0.008 Max. 1.40~1.65 0.10 Max. Cu 0.25 Max.
Ni 0.30 Max.
*POSWIND: POSCO Bearing Steel for Wind

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C Si Mn P S Cr others
POSHIS110 0.56~0.64 0.50~1.00 0.50~0.70 0.025 Max. 0.025 Max. 0.20~0.60
POSHIS120L 0.46~0.60 1.20~1.70 0.50~0.80 0.025 Max. 0.025 Max. 0.50~0.80 Nb, V
POSHIS120S 0.50~0.56 1.20~1.60 0.50~0.90 0.020 Max. 0.020 Max. 0.50~0.80 Cu, Ni, Ti, V
POSHIS125 0.51~0.57 1.40~1.70 0.55~0.80 0.017 Max. 0.017 Max. 0.60~0.80 Cu, Nb, B, Ni, Ti, V
POSHIS125RC 0.46~0.54 1.30~1.70 0.30~0.60 0.017 Max. 0.017 Max. 0.20~0.40 Cu, Nb, Ni, Mo, V
*POSHIS: POSCO High Strength Spring Steel

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C Si Mn P S Cu
POT62C 0.60~0.65 0.15~0.30 0.85~1.15 ~0.020 ~0.020 ~0.20
POT67C 0.65~0.70 0.15~0.30 0.85~1.15 ~0.020 ~0.020 ~0.20
POT70C 0.66~0.71 0.15~0.30 0.80~1.10 ~0.020 ~0.020 ~0.15

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C Si Mn P S
POSGRAM70 0.67~0.73 2.20~2.50 0.15~0.35 0.035 Max. 0.040 Max.
*POSGRAM: POSCO Graphite Steel for Machinability

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C Si Mn P S S-Al
POSCH6ASP 0.08 Max. 0.07 Max. 0.25~0.45 0.040 Max. 0.050 Max. 0.02 Min.
*POSCH6ASP: POSCO Cold Heading, 600Mpa, Al Killed, Spark Plug¿ë

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C Si Mn P S
JIS-SUYB1 ~0.01 ~0.05 0.20~0.30 ~0.020 ~0.015

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C Si Mn P S S-Al Cu Ni Cr
POSTEN30W 0.33~0.38 0.15~0.35 0.65~0.95 0.030 Max. 0.030 Max. 0.01~0.06 0.20~0.50 0.20~0.50 0.60~0.90
*POSTEN30W: POSCO Tensile, Carbon ¸ñÇ¥, Weathering

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C Si Mn P S S-Al Ni Cr Ti V others
POSMA45R 0.43~0.47 0.20~0.40 1.10~1.50 0.030 Max. 0.03~0.06 0.01~0.07 0.20 Max. 0.15 Max. 0.03 Max. 0.11 Max.
POSMA45RM 0.43~0.47 0.15~0.35 1.10~1.40 0.030 Max. 0.03~0.07 0.01~0.07 0.20 Max. 0.25 Max. 0.04 Max. 0.07 Max.
POSMA45RS 0.43~0.47 0.15~0.35 1.10~1.40 0.030 Max. 0.03~0.07 0.01~0.07 0.20 Max. 0.25 Max. 0.04 Max. 0.07 Max.
POSNH4 0.02~0.07 0.20 Max. 0.30~0.60 0.030 Max. 0.030 Max. 0.01~0.07 0.10 Max. 0.10 Max. - -
POSNH6 0.06~0.12 0.10~0.30 0.50~0.80 0.030 Max. 0.030 Max. - 0.10 Max. 0.30~0.50 - -
POSNH9S 0.23~0.29 0.10~0.30 1.30~1.60 0.030 Max. 0.030 Max. 0.01~0.07 0.10 Max. 0.10~0.30 - 0.05~0.20 Nb:0.005~0.02
*POSMA: POSCO Micro Alloyed
*POSNH: POSCO Non Heat Treatment

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C Si Mn P S B Cr Ti
POSA1021B 0.18~0.23 0.30~0.50 0.50~0.80 0.035 Max. 0.040 Max. 5ppm Min. 0.30 Max. 0.07 Max.
POSA1022B 0.18~0.23 0.15~0.30 0.70~1.00 0.020 Max. 0.020 Max. 5ppm Min. 0.25 Max. 0.01~0.05
POSA1038B 0.34~0.42 0.10~0.30 0.60~1.20 0.030 Max. 0.040 Max. 5ppm Min. 0.35 Max. -
POSA15B24H 0.22~0.28 0.15~0.35 0.90~1.20 0.025 Max. 0.025 Max. 5~30ppm 0.10~0.20 0.01~0.03
POSA5120BH 0.17~0.22 0.15~0.35 0.70~0.90 0.035 Max. 0.040 Max. 10~40ppm 0.70~0.90 0.02~0.05
*POSA: POSCO Automobile